intltool_update_potfile FILTER arg doesn't work as expected

[Larry Price]

When using intltool_update_potfile, an optional list of regular expressions can be passed in with the FILTER keyword. If passing in multiple regular expressions, source files are allowed through if they do not match one or more of the regular expressions (also allowing for duplicate entries). In my opinion, the expected behavior is that any source file that matches one of the given FILTER regular expressions should be removed from the list of files.