'matchpathcon_filespec_add64': symbol not defined

[peppergrayxyz]

build on musl/llvm fails with:

ld.lld: error: version script assignment of 'LIBSELINUX_3.8' to symbol 'matchpathcon_filespec_add64' failed: symbol not defined
cc: error: linker command failed with exit code 1 (use -v to see invocation)

see also: #477 (comment)
downstream bug: https://bugs.gentoo.org/972534