Make rpm spec less explicit
Fixes:
* current buildrpm failing on Fedora because of unexpected zeroconf extensions
* unowned directories hgext/*/
abort: repository a not found!
255
abort: error: Connection refused
255
abort: repository a not found!
255
abort: destination '../a' already exists
255
abort: repository a not found!
255
destination directory: q
abort: destination 'q' already exists