update build infrastructure for llvm-16.0.6

Update build infrastructure for LLVM 13.0.0.

Update clang build infrastructure for LLVM 11.1.0.

Heavy lifting by mortimer@, thank you so much!

Update build infrastructure for LLVM 10.0.0.

ok hackroom@
tested by plenty

Update clang build infrastructure for LLVM 8.0.0.

Build and install a shared libLLVM, llvm-config and llvm includes.
This is required to build the radeonsi Mesa driver.

ok patrick@

In preparation for reusing libLLVM component library Makefiles to build
libLLVM from a single directory avoid reused filenames by symlinking
duplicated names with a prefix of the component library na

In preparation for reusing libLLVM component library Makefiles to build
libLLVM from a single directory avoid reused filenames by symlinking
duplicated names with a prefix of the component library name so object
file names will be unique.

symlink approach suggested by deraadt@ ok patrick@

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add sources matching unresolved symbols seen using Mesa with libLLVM
ok patrick@

Update clang build infrastructure for LLVM 7.0.1.

Update clang build infrastructure for LLVM 6.0.0.

Update clang build infrastructure for LLVM 5.0.0.

zap empty depends/silence empty installs.
okay millert@

Update clang build infrastructure for LLVM 4.0.0

Discussed with kettenis@

Update clang build infrastructure for LLVM 3.9.1

"go ahead" kettenis@
"just go ahead" deraadt@
"sounds good to me" stefan@

LLVM/Clang build system. This only builds the bare minimum of what is needed
to get a working "clang" binary.

Note that you need GCC from ports to bootstrap clang.

looks good to patrick@, ok jsg@

LLVM/Clang build system. This only builds the bare minimum of what is needed
to get a working "clang" binary.

Note that you need GCC from ports to bootstrap clang.

looks good to patrick@, ok jsg@ kettenis@

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