graphics/mesa: Update to 19.0.8
Update mesa and related ports to 19.0.8.
This is the last version where the autotools build system is being used.
This serves as a stepping stone for reworking the ports to use the meson
build system and to enable further updates.
Submitted by: jbeich (with minor changes)
Differential Revision: https://reviews.freebsd.org/D19099https://reviews.freebsd.org/D19100
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Switch mesa and related ports to llvm80
Switch mesa over to use llvm80 instead of llvm60. Make it use the
global LLVM_DEFAULT instead of deciding for ourself which llvm version
to use. 
Fix build of lang/beginet 
Add patch from upstream to fix build of devel/libclc. The patch is taken
from the git mirror of devel/libclc rather than the SVN repo, for
Add a patch from mesa upstream preventing certain error messages when using
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