Correct the build rules of LLVM sanitizers

Fix generation of .a.syms files in LLVM sanitizers. The old rules weren't
functional and sometimes they were fatal in the build.

Add the .a.syms files to

Correct the build rules of LLVM sanitizers

Fix generation of .a.syms files in LLVM sanitizers. The old rules weren't
functional and sometimes they were fatal in the build.

Add the .a.syms files to distribution sets.
These files are generated only in certain .a files in 64bit version of
sanitizers.

Correct the location of files with LLVM sanitizers. Move the LLVM sanitizer
entries from base to comp files.

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Add compiler-rt build rules for LLVM sanitizers &co

Add build rules for LLVM in all the supported variations for NetBSD/amd64:

- asan
- xray
- tsan, dd
- libfuzzer
- msan
- safestack
- ubsan

Add compiler-rt build rules for LLVM sanitizers &co

Add build rules for LLVM in all the supported variations for NetBSD/amd64:

- asan
- xray
- tsan, dd
- libfuzzer
- msan
- safestack
- ubsan

These build rules compile functional sanitizers.

The build rules are still not hooked into the distribution build, as there
is pending work on backporting improvements for the llvm-8 branch needed
for netbsd-9 and newer.

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