old GCC versions.

for Win64.

to ios-image.cpp, but disable it on OS X because UIKit isn't available.

CppUnit is really too large for our needs, would require to be precompiled
for many platforms, in all combinations of debug and release modes, with
additional variants for libstdc++ versions. We replace it with our own
lightweight implementation, LolUnit. Good riddance.

instead of AC_TRY_COMPILE.

of code.

tested wherever relevant.

one except GL ES 2.x for now.

together with the --enable-experimental flag. Use LOL_DEBUG and
LOL_RELEASE instead of the previous values.