opencv: Use gcc for ppc64
opencv: Use gcc for ppc64

it will take some effort to fix it going with clang 14
due to VSX/altivec intrinsics conflicts

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

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