Use precompiled headers on MSVC

Use precompiled headers on MSVC

This is a significant improvement in build time on MSVC,
maybe 25% overall. Qualitatively, compile time is about 2x
faster, but link time, lack of parallelism for the whole
duration of the build, and some unaccelerated components
(e.g. glslang and some internal modules) reduce the total
wall clock time improvement from 50% down to that 25%.

This also helps a lot with performance of the builds for
generating mustpass lists.

Components: Vulkan, OpenGL, Framework
Change-Id: I6013d9728444d9892e9a5ec8f31a574c10ca06b2