Log message:
Pullup ticket #5268 - requested by sevan
lang/libLLVM: build fix

Revisions pulled up:
- lang/libLLVM/Makefile                                         1.21

---
   Module Name:    pkgsrc
   Committed By:   maya
   Date:           Mon Apr 10 19:49:59 UTC 2017

   Modified Files:
           pkgsrc/lang/libLLVM: Makefile

   Log message:
   libLLVM: use ln -sf, not ln -s. helps rebuilds, as the previous link
   already exists