FABIC: libunwind : Adding ./configure -related missing files from release tarball.
FABIC: libunwind: include/config.h.in from release tarball.
FABIC: lld: Removing llvm/tools/lld as build fails.
FABIC: ./environment.sh : wip fixes
FABIC: musl: include/endian.h : parenthesized a few expressions that generate too many warnings.

Did as recommended by Clang.
FABIC: musl : stdio.h & sys/stat.h : #define xxx64 xxx, related to LFS64(x) func. def. ; REPLACED with explicit decl.

For LLVM Clang compilation...