transfig: use patch file extension

pkgs/tools/graphics/transfig/patch-fig2dev-fig2dev.h.patch

@@ -0,0 +1,19 @@
+--- fig2dev/fig2dev.h.orig	Thu Dec 19 07:45:28 2002
++++ fig2dev/fig2dev.h	Tue Jan  7 20:08:45 2003
+@@ -22,7 +22,6 @@
+ #include <sys/file.h>
+ #include <signal.h>
+ #include <string.h>
+-#include <varargs.h>
+ #include <pwd.h>
+ #include <errno.h>
+ #include <time.h>
+@@ -210,7 +209,7 @@
+ #endif /* MAXPATHLEN */
+ #endif /* PATH_MAX */
+ 
+-#if ( !defined(__NetBSD__) && !defined(__DARWIN__))
++#if ( !defined(__NetBSD__) && !defined(__FreeBSD__) && !defined(__DARWIN__))
+ extern int		sys_nerr, errno;
+ #endif
+