(Only the first 10 of 12 ports in this commit are shown above. )
Update llvm-devel to a new snapshot.
Remove embedded compiler-rt build as that no longer works and create a
compiler-rt-devel port (currently supporting i386 and amd64, patches
welcome for other ARCHs).
Cause clang to ignore the -fformat-extensions argument.
Submitted by: Sender Ghost <firstname.lastname@example.org>