Log message:
Pullup ticket #6262 - requested by he
lang/llvm: powerpc build fix

Revisions pulled up:
- lang/llvm/options.mk                                          1.7

---
   Module Name:	pkgsrc
   Committed By:	he
   Date:		Mon Jul  6 07:16:00 UTC 2020

   Modified Files:
   	pkgsrc/lang/llvm: options.mk

   Log message:
   If on powerpc, add -mlongcall to CFLAGS and CXXFLAGS, to avoid
   "relocation truncated to fit: R_PPC_REL24" error.