Made a few code changes to allow MP code to compile under 64-bit Linux.
Merge branch 'master' of github.com:Razish/OpenJK
Fixed #280. Possibly #257 and #290 as well.
There is a possible bug in glibc (as mentioned here:
https://github.com/ioquake/jedi-academy/commit/d6bc68d63259234b83ceaec9464cebd2aa188374)
where the library is not unloaded properly. This causes global variables
to retain their previous values if the library is then reloaded. By
defaulting symbols to hidden, the library can be unloaded properly. This
may also fix a number of other issues as mentioned above.
Fixed #303. Changed Com_Errors in sound loading code to Com_Printf
Other half of commit for e8fc637 (fixes #280).
Fixed "libpng: bad parameters to zlib" error on Linux by adding option to
compile using the system-provided libpng library.
Fixed #284. Also added option to CMake to opt-out of building JK2 support
into OJK (BuilldJK2Support).
Display integer value of anisotropic filtering values in gfxinfo if the values are just integers.