* Make math library optional.
As the comment says, it should be optional on Windows and Haiku, but the check defaults to required.
* Don't make `unistd.h` required.
* Disable transparency plugin build as it's very busted.
* Add missing headers to fix compile on Windows.
* Use a fixed pref key for test plugin loading instead of `TEST_DATA_DIR`.
The latter is an absolute path, and thus unsuitable as a preference key, since it will not start with `/` on Windows.
* Add a missing pref initialization on Windows.
Testing Done:
Compiled and run tests on Windows.
Reviewed at https://reviews.imfreedom.org/r/308/
# SOME DESCRIPTIVE TITLE.
# Copyright (C) YEAR THE PACKAGE'S COPYRIGHT HOLDER
# This file is distributed under the same license as the PACKAGE package.
#
# Translators:
# Aleksandar Urosevic <urke@users.sourceforge.net>, 2003-2004
# Danilo Segan <dsegan@gmx.net>, 2003-2005
# Filip Miletic <f.miletic@ewi.tudelft.nl>, 2004
# Nikola Kotur <kotnik@ns-linux.org>, 2006
# Miloš Popović <gpopac@gmail.com>, 2007-2009
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"POT-Creation-Date: 2020-10-12 22:03-0500\n"
"PO-Revision-Date: 2017-09-19 19:26+0000\n"
"Last-Translator: Richard Laager <rlaager@wiktel.com>\n"
"Language-Team: Serbian (http://www.transifex.com/pidgin/pidgin/language/"