pull in fix from upstream for gxtags; this was causing repeated failures on exopi,

and i think this will also unbreak this port for i386

lang/gerbil/Makefile

@@ -1,6 +1,5 @@
-# $OpenBSD: Makefile,v 1.10 2020/08/19 11:28:29 jasper Exp $
+# $OpenBSD: Makefile,v 1.11 2020/11/04 18:46:01 jasper Exp $
 
-BROKEN-i386 =	fails after "[*] Build gerbil tags"
 BROKEN-powerpc64=gsc spins during build
 
 # Gambit doesn't have thread-local storage support on GCC platforms
@@ -11,6 +10,7 @@ COMMENT =	dialect of Scheme designed for systems programming
 GH_ACCOUNT =	vyzo
 GH_PROJECT =	gerbil
 GH_TAGNAME =	v0.15.1
+REVISION =	0
 
 CATEGORIES =	lang
 

lang/gerbil/patches/patch-src_tools_gxtags_ss

@@ -0,0 +1,20 @@
+$OpenBSD: patch-src_tools_gxtags_ss,v 1.1 2020/11/04 18:46:01 jasper Exp $
+
+https://github.com/vyzo/gerbil/commit/64968c943ac2a1900e9e19643c0e619d80ee108e
+
+Index: src/tools/gxtags.ss
+--- src/tools/gxtags.ss.orig
++++ src/tools/gxtags.ss
+@@ -241,8 +241,10 @@
+             (lp (fx1+ i) offs))))))))
+ 
+ (def (source-location-line locat)
+-  (let (filepos (##position->filepos (##locat-position locat)))
+-    (fx1+ (##filepos-line filepos))))
++  (if (##locat? locat)
++    (let (filepos (##position->filepos (##locat-position locat)))
++      (fx1+ (##filepos-line filepos)))
++    1))
+ 
+ (def (try-import-module filename)
+   (try