- Don't add extra compiler flags.
- Package the CUPS driver in sbindir and put a symlink in the CUPS
ServerBin directory to work around bug #231015.
- Disable libgutenprintui (GTK+ 1.2 library). Build requires gtk2-devel,
not gtk+-devel.
- No longer need PPDs sub-packages: CUPS driver is included in the cups
sub-package.