Prepare detection of pkgconfig with multiarch problems

* Move data/binaries/multiarch-dirs -> data/common/multiarch-dirs
* Add an hash value to $MULTIARCH_DIRS

Signed-off-by: Niels Thykier <niels@thykier.net>
Implement some simple testing of pkg-config file

Test if a arch indep file contains a multi-arch path

Signed-off-by: Niels Thykier <niels@thykier.net>