make this work on (even older) IRIX: check for __sgi rather than sgi

This was originally reported in PR 28819 by Georg Schwarz for db4 and
also noted by Georg to apply to this package.

databases/db/distinfo

@@ -1,6 +1,7 @@
-$NetBSD: distinfo,v 1.4 2005/02/23 16:33:05 agc Exp $
+$NetBSD: distinfo,v 1.5 2005/02/27 21:42:42 jschauma Exp $
 
 SHA1 (db-2.7.7.tar.gz) = 786e7f1be5f8d2dbdfa205a22ae9a5d1ead85701
 RMD160 (db-2.7.7.tar.gz) = 703dcddb69884c749637e07d592c4d1850981fd1
 Size (db-2.7.7.tar.gz) = 1112976 bytes
 SHA1 (patch-aa) = 80f46598f0859c0f0b2ed0aa737c5626e99201a2
+SHA1 (patch-ab) = f524ff9a01813c4384b830a860e32db24bf502f3

databases/db/patches/patch-ab

@@ -0,0 +1,13 @@
+$NetBSD: patch-ab,v 1.1 2005/02/27 21:42:42 jschauma Exp $
+
+--- ../include/db_185.h.orig	Sun Feb 27 16:27:52 2005
++++ ../include/db_185.h	Sun Feb 27 16:28:05 2005
+@@ -76,7 +76,7 @@
+  * XXX
+  * SGI/IRIX already has a pgno_t.
+  */
+-#ifdef	sgi
++#ifdef	__sgi
+ #define	pgno_t	db_pgno_t
+ #endif
+