[poppler] rtl text in gettext

[alex bodnaru]

hello friends,

i've recently posted a bug report (with a patch) for dumping of rtl related
text. now the dumped text is being reordered to best approximate the visual to
logical conversion using libicu, or at least fribidi, which is not specifically
intended to do this, but it still improves the current condition.

after decently testing it, i dare recommend it to you too:
https://bugs.freedesktop.org/show_bug.cgi?id=55977 .

failing to finalize the cmake related support, i'm asking your help here, in
order for the patch to be hopefully committed.

i also plan to improve the overall support for rtl, to also allow search and
select of mixed rtl and ltr text in a logical way.

best regards,
alex