ntdll: Tests for i386 system service requests (Int 2E and SYSENTER) (try 4)

[Paul Chitescu]

Changelog:
	ntdll: Tests for i386 system service requests (Int 2E and SYSENTER)

Windows is very picky on how the instructions are laid out around SYSENTER:
  mox edx,esp
  sysenter
  0+ nop (there may be a limit how many)
  ret

Changes from previous attempt:
- Skip SYSENTER tests below XP
- Skip all tests on WoW64 as it seems to use a different (64-bit) mechanism
- Fixed the version byte swapping to make correct decisions on what to test

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