Log Message:
Update yasm to 0.6.2.

Changes:
- AMD SSE4a and SSE5 instruction support.
- AMD LZCNT, POPCNT, EXTRQ, INSERTQ, MOVNTSD, and MOVNTSS instruction support.
- 16-bit float value (IEEE-754r half precision) support (desirable for SSE5).
- Added "oword", "do", and "reso" aliases for \ 
"dqword", "ddq", "resdq".
- Added easier RIP-relative addressing with rel/abs modifiers and "default"
  directive to set default rel/abs mode (see AMD64 for details).
- CPP preprocessor. Contributed by Paul Barker
- GAS local labels (1:, 1f, 1b) support. Noticed by Jung Lee
- GAS .org fill parameter support. Noticed by Jung Lee and Xiaoming Mo
- Command line aliases for -d (-D) and -u (-U) for increased NASM command line
  compatibility. Requested by Mike Frysinger
- ..gotpc ELF32 bugfix: #114
- Minor bugfixes (CPU setting for a few instructions, hash lookup).