Backport devel/libffi/patches/patch-configure so that it passes

configure step on hppa/mips/powerpc. Well, hppa & mips are not (yet?) in
ONLY_FOR_ARCHS, so that should only affect powerpc..

www/firefox36/patches/patch-js_ctypes_libffi_configure

@@ -0,0 +1,31 @@
+$OpenBSD: patch-js_ctypes_libffi_configure,v 1.1 2010/03/30 08:11:22 landry Exp $
+backported from devel/libffi/patches/patch-configure
+--- js/ctypes/libffi/configure.orig	Tue Mar 30 09:45:39 2010
++++ js/ctypes/libffi/configure	Tue Mar 30 09:54:29 2010
+@@ -20976,7 +20976,7 @@ case "$host" in
+ 	TARGET=FRV; TARGETDIR=frv
+ 	;;
+ 
+-  hppa*-*-linux* | parisc*-*-linux*)
++  hppa*-*-linux* | hppa*-*-openbsd* | parisc*-*-linux*)
+ 	TARGET=PA_LINUX; TARGETDIR=pa
+ 	;;
+   hppa*64-*-hpux*)
+@@ -21017,7 +21017,7 @@ case "$host" in
+   mips-sgi-irix5.* | mips-sgi-irix6.*)
+ 	TARGET=MIPS; TARGETDIR=mips
+ 	;;
+-  mips*-*-linux*)
++  mips*-*-linux* | mips*-*-openbsd* )
+ 	TARGET=MIPS; TARGETDIR=mips
+ 	;;
+ 
+@@ -21033,7 +21033,7 @@ case "$host" in
+   powerpc-*-aix* | rs6000-*-aix*)
+ 	TARGET=POWERPC_AIX; TARGETDIR=powerpc
+ 	;;
+-  powerpc-*-freebsd*)
++  powerpc-*-freebsd* | powerpc-*-openbsd* )
+ 	TARGET=POWERPC_FREEBSD; TARGETDIR=powerpc
+ 	;;
+   powerpc*-*-rtems*)