clang: Use -mno-altivec for ppc 7400
clang: Use -mno-altivec for ppc 7400

Workaround qemuppc illegal instruction trap on vxor instruction emulation
this instruction is emitted by clang with -mcpu=7400 on ppc32 when
compiling musl/strspn.c file

The crash shows up running qemu-ppc via gobject-introspection, so a long
unwieldy path but we know whats happening

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

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