[MP] Remove unused extern qboolean charSet.
[MP] Merge ioquake/ioq3@89f7863254d343528d5834cd8bb0929776a3e79b
bugzilla bug #5273
exploit resolved, we're now disallowing forwardmove of -128 and vice versa

Thanks, devhc!
[JK2SP] Removed unused pointer variable.
[MP] Fix crash when drawing input fields
[SP] Fixed GL_ResetBinds when multitexture extensions aren't available.
[MP] Fixed GL_ResetBinds when multitexture extensions aren't available.