FreeBSD/src 24b8043 (r351462)lib/clang/libllvm Makefile, usr.bin/clang/llvm-mca Makefile

Update build glue for a build of clang plus the extra tools (enabled via
MK_CLANG_EXTRAS).
DeltaFile
+8-0lib/clang/libllvm/Makefile
+5-0usr.bin/clang/llvm-objcopy/Makefile
+1-0usr.bin/clang/llvm-mca/Makefile
+1-0usr.bin/clang/llvm-pdbutil/Makefile
+15-04 files

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