rpm 5.2 and 5.3 allow packaging of specs with empty %files directives

[Jeremy Huntwork]

Currently, if your package installs files, but you don't list any under %files, rpmbuild packages up an empty rpm. Expected behavior is that it would fail and list the found, unpackaged files.

See the attached example spec file. Building it as is will produce an empty rpm. Adding '/file1' under the %files directive will produce the expected error and list the other 8 found but unpackaged files.