Allow OBS build without explicit version tag

MCE has version information recorded in several files. To keep these
in sync, there is a script that will cause rpm builds to fail unless
all of the places have the same version.

While this is good for making sure releases do not end up using out
of sync version numbers, it also makes it impossible to build mce
in OBS without creating explicit version tag.

Relax the version checking for spec file so that versions constructed
from matching version + extra git hash identification are also accepted.