data: don't check mutter/shell versions

This effectively reverts commit fdc07aee

The reason is two fold:

1) it may cause problems for distros that ship the mutter binary in a
   subpackage separate from libmutter
2) it was meant to make life a little easier for distributors for the
   3.1.90 release.  That release is over now, and it didn't actually
   make life any easier for distributors anyway because of other bugs.

https://bugzilla.gnome.org/show_bug.cgi?id=658429