Pullup ticket #5453 - requested by sevan
lang/guile20: FreeSD build fix

Revisions pulled up:
- lang/guile20/Makefile                                        1.13

---
  Module Name:    pkgsrc
  Committed By:  ryoon
  Date:          Wed May 17 12:06:20 UTC 2017

  Modified Files:
          pkgsrc/lang/guile20: Makefile

  Log Message:
  Fix packaging under FreeBSD/amd64 10.2 and 11.0

  At least under 10.2, 10.3-RC3 and 11.0, GUILE_LIBNAME is so.22.8.1 like
  other platforms.

(bsiegert)