changes to mozilla ports

[Jose M Rodriguez]

Hi,
I'm testing a new version of PR ports/75729, but against mozilla-devel, 
that will be send-pr soon, and found some points to improve our mozilla 
port.

1) I think we must move from configure options to a mozconfig file, at 
last, for -devel, and share the same configure method with firefox.

2) We only do gtk2 builds, so I think we must lost the WITHOUT_XFT knob.

3) I think we'll install a download chatzilla.xpi instead of build one 
from mozilla sources.  Seems to be more stable that the code from 
mozilla.

4) I'll glad of known about cairo builds with --enable-cairo.  mozilla 
docs seems to point to aditional canvas properties with this.

5) I think we must download and build enigmail with mozilla and a 
default disabled knob.

6) I try to build with --enable-pango, but got lost of configure errors.  
Mozilla docs points that this may enable better support for some langs.

Apart of this, I got some problems with mozilla-devel and calendar.  Bad 
export target in libical

thanks in advance,
--
  josemi