K 10
svn:author
V 6
pkubaj
K 8
svn:date
V 27
2019-11-29T21:37:03.493845Z
K 7
svn:log
V 378
graphics/mesa-dri: fix build on powerpc64 elfv2

Base LLVM9 fails to build this port with clang crash (reported on https://bugs.llvm.org/show_bug.cgi?id=43862). The port builds when using LLVM8. Since we depend on LLVM8 anyway, use it also for compilation on elfv2.

Approved by:	zeising (maintainer), tcberner (mentor)
Differential Revision:	https://reviews.freebsd.org/D22274

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