Remove unused array joy_pressed
Remove unused cvar in_joystickDebug
Fix overstrike/insert logic being reversed in q3_ui
Don't draw client console buffer past top of screen

Thanks @Pan7.
Restore drawing a cut off client console line in 1920x1080

The text lines don't meet at top of the sceen in 1920x1080, restore
drawing a cut off line across the top. In 640x480 this line isn't seen
at all. This is still better then trying to draw twice as many lines
than are actually seen (the way it was before the last commit).
Fix fast-math optimize flag for MinGW x86_64 build

Found by /dev/humancontroller.
Merge remote-tracking branch 'ioquake3/master'

Conflicts:
	code/client/cl_console.c
	code/q3_ui/ui_mfield.c
	code/sdl/sdl_input.c