- get the version dynamically
- move more common stuff into common.mk

Fix LLVM sanitizer build by GCC (HAVE_LLVM=no)

Do not error if a priority from 0 to 100 is used for constructor or
destructor.

Use -Wno-error to silence all errors from this warning type. There sho

Fix LLVM sanitizer build by GCC (HAVE_LLVM=no)

Do not error if a priority from 0 to 100 is used for constructor or
destructor.

Use -Wno-error to silence all errors from this warning type. There should
be used -Wno-prio-ctor-dtor, but it's not supported by GCC7.

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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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