Feed more generated files to the clean target; joint work with naddy@

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

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@

Add infrastructure to compile and link LLDB. Inspecting core files
works, but actually running stuff probably won't.

ok kettenis@