Fix some minor issues in the spec file
Fix some minor issues in the spec file

The %{_includedir}/blockdev directory has to be owned by some package and since
installing any of our -devel packages on its own makes perfect sense, all these
packages should own the directory so that it is not unowned in any case.

Also the dependency on the libblockdev-utils-devel package should specify
architecture.

rhinstaller/libblockdev,dashea/libblockdev,vpodzime/libblockdev,atodorov/libblockdev,atodorov/libblockdev,snbueno/libblockdev,vpodzime/libblockdev,vpodzime/libblockdev,rhinstaller/libblockdev,rhinstaller/libblockdev,snbueno/libblockdev,dashea/libblockdev,atodorov/libblockdev