Set proper linkage of export symbols
Fix compiling of rtcw (sp) under GCC
Fix compiling of cgame (mp) under GCC
Fix compiling of rtcw (mp) under GCC
Fix compiling of game (mp) under GCC
Fix compiling of rtcw (et) under GCC
Fix compiling of ui (et) under GCC
Fix compiling of cgame (et) under GCC
Fix compiling of game (et) under GCC
Fix compiling of game (sp) under GCC