CPU detection with GCC and Clang
Add missing includes
Merge pull request #4 from dubhater/cpuid

CPU detection with GCC and Clang
Fix compiler warning
Remove unused statements
Fix handling of infinities in float_to_half
Use exact width types when bit casting
Add crappy build system for Unix
Makefile: Install the headers
Add paramater --enable-x86simd (disabled by default)

And hopefully allow compiling for non-x86 systems.
Make the VapourSynth plugin a separate library