swr/rasterizer: improvements in simdlib

swr/rasterizer: improvements in simdlib

1. fix build issues with MSVC 2019 compiler

The MSVC 2019 compiler seems to have an issue with optimized code-gen
when using the _mm256_and_si256() intrinsic.
Only disable use of integer vpand on buggy versions MSVC 2019.
Otherwise allow use of integer vpand intrinsic.

2. Remove unused vec/matrix functionality

Reviewed-by: Alok Hota <alok.hota@intel.com>