Put back alloca.h, it's required on at least SunOS. Change the configure

test to make it non-fatal for it to be missing instead.

audio/jack/distinfo

@@ -1,4 +1,4 @@
-$NetBSD: distinfo,v 1.18 2016/02/10 09:19:22 wiz Exp $
+$NetBSD: distinfo,v 1.19 2016/02/14 09:22:47 jperkin Exp $
 
 SHA1 (jack-audio-connection-kit-0.124.1.tar.gz) = e9ba4a4c754ec95fbe653dcf7344edd6cc47cd60
 RMD160 (jack-audio-connection-kit-0.124.1.tar.gz) = 075c6ce5342d31e359908c01d7123f20818021aa
@@ -9,7 +9,7 @@ SHA1 (patch-ab) = 8531e1af0c3781a238d3793bdd58577ed598b67a
 SHA1 (patch-ad) = 3f13c886c7564f7f0b494c7891fcc3c945cf15ba
 SHA1 (patch-af) = 2a40f3a51a088e62352d7cdcc27eb41f3064ae7e
 SHA1 (patch-ah) = 09965c317dfabfc9f867cfd69d68e69724d17b38
-SHA1 (patch-aj) = af1b33de7e1e2a938f6a21fa3a32ea2834ee1c36
+SHA1 (patch-aj) = f03901740098fdebf7711c333f959a2d6c2f20f7
 SHA1 (patch-ak) = 90006096f7c4035edea75ebebeff58c18f04e39e
 SHA1 (patch-ao) = 60930e5ecd408ebccbca8342083189b7d2d06a1b
 SHA1 (patch-ap) = f80d1547051324d9b241ce64027f13a5120ce5da

audio/jack/patches/patch-aj

@@ -1,19 +1,19 @@
-$NetBSD: patch-aj,v 1.5 2016/02/10 09:19:22 wiz Exp $
+$NetBSD: patch-aj,v 1.6 2016/02/14 09:22:48 jperkin Exp $
 
 Kill all of the overzealous optimization; if the user wants this,
 there is devel/cpuflags and mk.conf.
 
 --- configure.orig	2014-01-22 20:23:47.000000000 +0000
 +++ configure
-@@ -14969,7 +14969,7 @@ _ACEOF
+@@ -14980,7 +14980,7 @@ eval as_val=\$$as_ac_Header
+ _ACEOF
+ 
+ else
+-  as_fn_error "*** a required header file is missing" "$LINENO" 5
++  : as_fn_error "*** a required header file is missing" "$LINENO" 5
  fi
  
- # headers
--for ac_header in string.h strings.h alloca.h db.h
-+for ac_header in string.h strings.h db.h
- do :
-   as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
- ac_fn_c_check_header_mongrel "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default"
+ done
 @@ -15793,7 +15793,7 @@ rm -f core conftest.err conftest.$ac_obj
  
  $as_echo "#define x86 1" >>confdefs.h