Makes is possible to build kvazaar using nasm instead of yasm.
- Adds trailing slashes to -I params in ASFLAGS.
- Disables CPU NOP directives when assembler is not yasm.
- This doesn't compile, but I'm including it to have a version history for
changes required to make it work.
- We need this for to have a getopt implementation on Windows.
- It's necessary to change the implementation to switch from GPL to LGPL.