Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.Approved by: re (implicit)Sponsored by: The FreeBSD Foundation
MFC r239614:Sprinkle a bit of style.Makefile(5) across various clang Makefiles. Nofunctional changes.
Copy head to stable/9 as part of 9.0-RELEASE release cycle.Approved by: re (implicit)
Import the build makefiles for clang/LLVM.Approved by: ed (mentor)