Description of problem:

Packaging a nautilus-python extension will either produce serious rpmlint warnings or break on some platforms.

Version-Release number of selected component (if applicable):  0.7.0-3.1

How reproducible: always

Steps to Reproduce:
1. Write a nautilus-python extension
2. Try to package it using the same extension library as
   nautilus-python i. e.,  %{_libdir}/nautilus/extensions-2.0/python/
3. Watch rpmlint warnings about noarch extension referring to %{_libdir}
4. Realize that not using %{_libdir} will break extension on some platforms
  
Actual results: see above

Expected results: rpmlint should be silent, extension should work on all architectures.

Additional info:

IMHO, the extension path should be hardcoded to /usr/lib/nautilus/extensions-2.0/python