Update wxWidgets to fix recompile thing in MSVC.
Fix operand order in DSTST instruction.

No functional change.  Also, switch SC to use a u32 for more typesafe
opcode decoding - also no functional change.
Fix SRAWI instruction decoding.

It's SH, not sh.  Lowercase combines bits from two fields.
Add missing TD instruction.
Add missing LSWX and STSWX instructions.
Add missing STFSUX/STFDUX instructions.
Add missing ICBI instruction.
Merge pull request #220 from unknownbrackets/opcodes

Add a few missing opcodes, fix SRAWI