openharmony-standard: Add a sanity check function for lib paths

This change adds a post do_install() function that checks if all
subfloders copied from system/lib/module are set in the distro variable
MUSL_LDSO_PATHS and thus are part of the ld-musl-${MUSL_LDSO_ARCH}.path
file.

Signed-off-by: Thierry Escande <thierry.escande@huawei.com>