This also ensures UTF-16 ActualText strings are converted to UCS-4
before calling addChar.

TextOutputDev will start a new line when encountering consecutive
glyphs with overlapping bounding boxes. This can occur when drawing
diacritics with a separate glyph. In this case, due to the diacritic
having a different baseline, the lines may be output in the wrong
order.

This patch increases the tolerance for overlapping bounding boxes to
prevent diacritics from splitting lines.

to ensure only UCS-4 values are used with the "Unicode" type.

File to try in KDE bug #306008

Otherwise we might end up asserting

https://bugs.freedesktop.org/show_bug.cgi?id=53586

no public header uses them anymore, so need to expose them

fontconfig is used only in .cpp sources inside the 'poppler' subdirectory, so there is no need to add the include paths for it in other directories;
likewise, do not to link to it if not needed

Makes some people happier and it doesn't hurt us much
Bug #53159

Reviewed by Jose Aliste
Bug #3498

Bug 52488

Bug #52384

Fixes build in Solaris 10
Bug #52426

Bug #52215

Bug 51982

Bug 52193

Bug 52197

Bug #51822

Bug #49523

bug #51548

Bug 51479

Fixes crash in broken/fuzzed pdf sent by Mateusz "j00ru" Jurczyk and Gynvael Coldwind

Fixes abort in KDE bug #302372

Fixes bug #51369

Don't recurse infinitely if the /Annots object contains annotation
dictionaries (according to specs, /Annots must contain *references*
to annotation dictionaries).

Fixes bug #51361