musl: Remove workaround to disable -frounding-math
musl: Remove workaround to disable -frounding-math

The hang in clang seems to gone with clang12
remove dependecy on gcc-cross if using clang to compile musl

Signed-off-by: Khem Raj <729d64b6f67515e258459a5f6d20ec88b2caf8df@gmail.com>

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