The RtlU*ByteSwap() family:
- has FASTCALL calling convention
- is only exported from ntdll and ntoskrnl.exe in 32bit mode
  (didn't check ARM though)

Wine's support for RtlUlonglongByteSwap() doesn't follow these constraints.
Note: in __fastcall, 64bit paramaters are passed on the stack, to
RtlUlonglongByteSwap() calling convention acts as __stdcall.

So:
- fix ntdll.spec (resp. ntoskrnl.exe.spec) to only export
  (resp. forward) RtlUlonglongByteSwap for i386
- always provide an inline implementation in winternl.h
- reimplement ntdll.RtlUlonglongByteSwap() for i386 with
  __fastcall calling convention.
- fix ntdll/tests/rtl.c to use correct calling convention.
- add test in ntdll/tests/rtl.c for inlined version.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=53536Signed-off-by: Eric Pouech <eric.pouech@gmail.com>