Add simple patch to fix undefined symbol problems when trying to build

gjs with this spidermonkey version.

Approved by:	maintainer
Obtained from:	https://bugzilla.mozilla.org/show_bug.cgi?id=1426865

lang/spidermonkey60/Makefile

@@ -2,6 +2,7 @@
 
 PORTNAME=	spidermonkey
 DISTVERSION=	60.9.0
+PORTREVISION=	1
 CATEGORIES=	lang
 MASTER_SITES=	MOZILLA/firefox/releases/${DISTVERSION}esr/source
 PKGNAMESUFFIX=	${SP_VER}

lang/spidermonkey60/files/patch-js_public_TypeDecls.h

@@ -0,0 +1,26 @@
+https://bugzilla.mozilla.org/show_bug.cgi?id=1426865
+
+Add "dumb" patch to fix undefined symbols when trying to build gjs against
+this spidermonkey version.
+
+This issue was fix in firefox and backported to esr 68.
+
+--- js/public/TypeDecls.h.orig	2019-09-01 13:09:17 UTC
++++ js/public/TypeDecls.h
+@@ -20,6 +20,8 @@
+ #include <stddef.h>
+ #include <stdint.h>
+ 
++#pragma GCC visibility push(default)
++
+ #include "js-config.h"
+ 
+ typedef uint8_t jsbytecode;
+@@ -89,5 +91,7 @@ typedef PersistentRooted<JS::Symbol*> PersistentRooted
+ typedef PersistentRooted<Value> PersistentRootedValue;
+ 
+ }  // namespace JS
++
++#pragma GCC visibility pop
+ 
+ #endif /* js_TypeDecls_h */