Fix a few warnings

Conflicts:
	code/botlib/be_aas_reach.c
	code/botlib/l_precomp.c
	code/game/bg_misc.c
	code/opus-1.1/src/opus_decoder.c
	code/opusfile-0.5/src/opusfile.c
	code/qcommon/md4.c
	code/qcommon/msg.c
	code/qcommon/net_ip.c
	code/renderergl1/tr_bsp.c
	code/renderergl1/tr_shader.c
	code/sys/sys_unix.c
Fix cgame warnings

Conflicts:
	code/cgame/cg_newdraw.c
	code/cgame/cg_snapshot.c
Fix ui warnings

Conflicts:
	code/q3_ui/ui_preferences.c
	code/q3_ui/ui_video.c
Fix game warnings
Fix more warnings

Conflicts:
	code/game/ai_vcmd.c
	code/game/g_items.c
	code/renderergl2/tr_bsp.c