Fix build by removing declaration for deprecated and unreferenced

sys_nerr variable.

PR:		39147
Submitted by:	keramida
Prodded by:	des

editors/emacs20/files/patch-src_emacs.c

@@ -0,0 +1,13 @@
+
+$FreeBSD$
+
+--- src/emacs.c.orig	Wed May 24 15:58:54 2000
++++ src/emacs.c	Mon Jul 29 23:23:20 2002
+@@ -602,7 +602,6 @@
+   char stack_bottom_variable;
+   int skip_args = 0;
+   extern int errno;
+-  extern int sys_nerr;
+ #ifdef HAVE_SETRLIMIT
+   struct rlimit rlim;
+ #endif