[SP] Win64: Enable OpenAL only for x86 Windows.
[MP] Win64: Fixed missing USE_OPENAL replacement
[SP] Win64: Corrected types
[SP] Win64: Simplified timing_c class

This commit replaces the asm code for using the rdtsc instruction with the
__rdtsc() instrinsic.
[MP] Win64: Simplified the timing_c class.

This commit replaces the asm for the rdtsc instruction with the __rdtsc()
instrinsic.
[SP] Win64: Update the build system for Win64.
[SP] Fixed NPC jumping (same fix as from MP)
[MP] Don't require OpenAL when building for Win64