If the zoom factor is zero, don't construct a new font name - the

If the zoom factor is zero, don't construct a new font name - the
supplied font name is correct.  That lets us handle fonts whose size we
can't change because this is GTK+ 1.2[.x] and the name isn't an XLFD
name so we don't know where the size is.

In "font_zoom()", remove some code from the GTK+ 1.2[.x] vs. GTK+ 2.x
#ifdefs.

Fix the comment for "font_zoom()".

Get rid of a no-longer-used "simple_dialog()" argument.

git-svn-id: http://anonsvn.wireshark.org/wireshark/trunk@9814 f5534014-38df-0310-8fa8-9805f1628bb7