Fixes CORE-15558 "AbiWord font listbox should display a specific font only once, but displays each of them many times instead"
which regressed by SVN r75491 == 0.4.7-dev-32-g d10c0ec112
by porting back the commits:
0.4.12-dev-320-g 6e4e5a004c
and
0.4.13-dev-107-g ae8417fd90 to prevent introducing another regression CORE_15785 with the initial fix.
and some more addendums to prevent introducing regression CORE_15755
I verified afterwards that all 3 issues: CORE-15558, CORE_15785 and CORE_15755 are in fixed state.
Actually I don't really like the resulting code due to the qsort() that it introduces into
win32ss/gdi/gdi32/objects/font.c
We did not need that at all before 0.4.7-dev-32-g d10c0ec112
In case that qsort() would ever reveal any new trouble like reduced performance or stack overflow,
we should structurally revert all that context to 0.4.7-dev-31 instead.
IntEnumFontFamilies() is called immediately upon process initialization for many applications and the qsorted-list is *huge*,
so this indeed could be relevant for performance.
5f0c98f291