PackagingDrafts/Non-obvious spec file items

Addition to ReviewGuidelines
SHOULD: Anything in the spec file which is not obvious should have a comment explaining it.

Non-Obvious Items in Spec Files
Anything in the spec file which is not obvious should have a comment explaining it.

Some examples of non-obvious items could include (but are not limited to):
 * Some explicit requires
 * Changes to optflags
 * Not using  or make install
 * Provides/Obsoletes
 * Modified tarballs
 * Licensing or legal related changes