mpd: make this build on NetBSD/powerpc 10.0_BETA.

Seldom have I seen a program so crusty, e.g. wanting to declare
standard library functions on its own(!)  There are still *lots*
of warnings produced during the build.

"make test" has lots of tests failing for NetBSD/macppc, but at
least quite a few succeed as well.  That's at least something...

lang/mpd/distinfo

@@ -1,4 +1,4 @@
-$NetBSD: distinfo,v 1.11 2021/10/26 10:51:43 nia Exp $
+$NetBSD: distinfo,v 1.12 2023/02/16 17:59:49 he Exp $
 
 BLAKE2s (mpd-language/mpd.1.0.1.tgz) = beafa8fb9b4d0a1b35f99f72b1959a308dcb2f4c3348cbe087f640db5e20992e
 SHA512 (mpd-language/mpd.1.0.1.tgz) = bbd3d99161b6e041042c5fbef42fd14ca46e7ebec00f945ae1d0e4f752b02d03f89cddc9615367105331af496a9f0908e375fe7f7bda15eeb3287752c6e4b61b
@@ -8,7 +8,7 @@ SHA1 (patch-ab) = 2a086280fefb4acddd19cb3cbafd58f8de5b309e
 SHA1 (patch-ar) = 2cb9c743870aa91edb77f83b4ce4c36424a6bb5b
 SHA1 (patch-as) = e3ec11eace9d11349077adcf4e5bb16ac6e3e1a4
 SHA1 (patch-at) = e96ef9ceee5edc32e33b6aa80b949e7ebd188b9a
-SHA1 (patch-au) = 7d2ebdef6c007a286b0dc0ab007039d4dbca67ed
+SHA1 (patch-au) = e90c5fe0f8e8b397ed2ac412013e0968606d0e9c
 SHA1 (patch-av) = 49727b74c938e15d87447b4a7dcdc09840593351
 SHA1 (patch-aw) = b7849bfaa2bbdf218d09147ef0461e4fcbd7e7f6
 SHA1 (patch-ax) = 1ed20dc2f4f0fb086a267d60de85ef6c9f1629ee
@@ -27,3 +27,5 @@ SHA1 (patch-bj) = c5123801140fbfdcbfdabbcd39fe70d2e71355fc
 SHA1 (patch-bk) = b51a6e1ead24feee415dd875fb049b8071f7c229
 SHA1 (patch-bl) = 80f35b366bb6ccf9eaf07ae772a6406cac8b24b9
 SHA1 (patch-bm) = 3f5f3143451b8509b94188e5ce1c375f9bd2619f
+SHA1 (patch-gen.h) = dd051c5adb4eb5b72ba899266283c9dbb9d2569a
+SHA1 (patch-mpd_main.c) = ae71569e772314099d272e0d1860d4e6c3d9cb93

lang/mpd/patches/patch-au

@@ -1,10 +1,8 @@
-$NetBSD: patch-au,v 1.2 2015/12/29 23:34:52 dholland Exp $
+$NetBSD: patch-au,v 1.3 2023/02/16 17:59:49 he Exp $
 
-Context switch code for NetBSD.
-
---- csw/netbsd.c.orig	2005-03-02 13:00:06.000000000 +0000
+--- csw/netbsd.c.orig	2023-02-16 17:24:05.920061403 +0000
 +++ csw/netbsd.c
-@@ -0,0 +1,112 @@
+@@ -0,0 +1,138 @@
 +/*
 + *  netbsd.c -- context switch code for NetBSD 2.
 + *
@@ -44,6 +42,32 @@ Context switch code for NetBSD.
 +}
 +#endif
 +
++#ifdef __powerpc__
++void pthread__init(void);
++
++#define _setcontext_u(uc)       (*_md_setcontext_u)(uc)
++#define _swapcontext_u(oc,nc)   (*_md_swapcontext_u)(oc,nc)
++
++static void mpd_setcontext_u(ucontext_t *);
++static void mpd_swapcontext_u(ucontext_t *, ucontext_t *);
++
++void (*_md_getcontext_u) (ucontext_t *);
++void (*_md_setcontext_u) (ucontext_t *)                 = mpd_setcontext_u;
++void (*_md_swapcontext_u)(ucontext_t *, ucontext_t *)   = mpd_swapcontext_u;
++
++static void
++mpd_setcontext_u(ucontext_t *uc) {
++        pthread__init();
++        setcontext(uc);
++}
++
++static void
++mpd_swapcontext_u(ucontext_t *oldc, ucontext_t *newc) {
++        pthread__init();
++        swapcontext(oldc, newc);
++}
++#endif
++
 +
 +/*
 + *  mpd_build_context (func, buf, bufsize, arg1, arg2, arg3, arg4)

lang/mpd/patches/patch-gen.h

@@ -0,0 +1,39 @@
+$NetBSD: patch-gen.h,v 1.1 2023/02/16 17:59:49 he Exp $
+
+Don't declare library functions on your own on NetBSD,
+instead, use standard headers.
+
+--- gen.h.orig	2000-10-31 22:53:40.000000000 +0000
++++ gen.h
+@@ -32,9 +32,15 @@
+  *  Don't use protoypes here; increases conflicts with system include files.
+  */
+ 
++#if defined(__NetBSD__)
++#include <stdlib.h>
++#include <unistd.h>
++#include <string.h>
++#else
+ char *getenv(), *getcwd();
+ char *strcat(), *strncat(), *strchr(), *strrchr(), *strcpy(), *strncpy();
+ void exit();
++#endif
+ 
+ /* int functions are not explicitly defined -- use implicit definitions */
+ /* This avoids conflicts on Solaris (at least) where strlen is a size_t fn */
+@@ -43,11 +49,15 @@ void exit();
+ double fmod();	/* not in Sequent <math.h> */
+ 
+ #if defined(__STDC__) || defined(__sgi) || defined(_AIX) || defined(__alpha)
++# if !defined(__NetBSD__)
+ void *malloc(), *realloc();
+ void *memset(), *memcpy();
++# endif
+ #else
++# if !defined(__NetBSD__)
+ char *malloc(), *realloc();
+ char *memset(), *memcpy();
++# endif
+ #endif
+ 
+ 

lang/mpd/patches/patch-mpd_main.c

@@ -0,0 +1,46 @@
+$NetBSD: patch-mpd_main.c,v 1.1 2023/02/16 17:59:49 he Exp $
+
+--- mpd/main.c.orig	2000-10-31 22:53:42.000000000 +0000
++++ mpd/main.c
+@@ -11,7 +11,7 @@ static void dofile	PARAMS ((char *filena
+ static int  concrete	PARAMS ((Nodeptr e));
+ static void genmake	PARAMS ((Nodeptr e));
+ static void gmake	PARAMS ((Nodeptr e, char *rtype, char *half));
+-static void link	PARAMS ((char *files[]));
++static void my_link	PARAMS ((char *files[]));
+ 
+ 
+ 
+@@ -42,6 +42,7 @@ static char *oname;			/* output file nam
+ 
+ /*  main program  */
+ 
++int
+ main (argc, argv)
+ int  argc;
+ char *argv[];
+@@ -101,7 +102,7 @@ char *argv[];
+     } else {
+ 	if (!option_q)
+ 	    fprintf (stderr, "linking:\n");
+-	link (argv + optind);		/* exec mpdl to build executable file */
++	my_link (argv[optind]);		/* exec mpdl to build executable file */
+ 	/*NOTREACHED*/
+     }
+ }
+@@ -348,13 +349,13 @@ char *dir, *fname;
+ 
+ 
+ 
+-/*  link (files) -- run mpdl to link the components we have compiled
++/*  my_link (files) -- run mpdl to link the components we have compiled
+  *
+  *  "files" is portion of orig argv containing file names (including MPD files).
+  */
+ 
+ static void
+-link (files)
++my_link (files)
+ char *files[];
+ {
+     char path [MAX_PATH];