Pullup ticket #4247 - requested by bsiegert
lang/gawk: build fix

Revisions pulled up:
- lang/gawk/Makefile                                            1.57
- lang/gawk/PLIST                                               1.20
- lang/gawk/distinfo                                            1.25
- lang/gawk/patches/patch-extension_configure                   1.1

---
   Module Name:    pkgsrc
   Committed By:   bsiegert
   Date:           Sat Oct 19 19:47:39 UTC 2013

   Modified Files:
           pkgsrc/lang/gawk: Makefile PLIST distinfo
   Added Files:
           pkgsrc/lang/gawk/patches: patch-extension_configure

   Log Message:
   Fix build on MirBSD.

   The gawk developers added code to skip building the extensions on MirBSD
   but inserted a syntax error. Also skip the extensions in the PLIST on MirBSD.
Pullup ticket #4247.