python: revise path to pkgconfig directory.
python: revise path to pkgconfig directory.

Because path to pkgconfig directory depends on MULTIARCH variable.
MULTIARCH is printed by compiler so it might be empty or has value.
Remove MULTIARCH from LIBPC and keep pkgconfig directory same to meta.

Signed-off-by: Nguyen Thi Huong <abd0688d291555087e4872869b7bb9c885585746@toshiba-tsdv.com>

meta-debian/meta-debian,meta-debian/meta-debian,meta-debian/meta-debian,meta-debian/meta-debian,meta-debian/meta-debian,meta-debian/meta-debian