toolchain-clang: Specify -ffile-compilation-dir to omit absolute file paths in debug info
toolchain-clang: Specify -ffile-compilation-dir to omit absolute file paths in debug info

Clang does not remap the src filename in asm files debug info when using
-fdebug-prefix-map but gcc does [1], however, there is an option to help
reproducibility with clang namely ffile-compilation-dir to remove the
source directory from path. use it globally with clang compiler

[1] https://github.com/llvm/llvm-project/issues/56609
Signed-off-by: Khem Raj <729d64b6f67515e258459a5f6d20ec88b2caf8df@gmail.com>

kraj/meta-clang,kraj/meta-clang,kraj/meta-clang