[SHELL32] Partially synchronize wine/shellpath.c with Wine.

[SHELL32] Partially synchronize wine/shellpath.c with Wine.

- Adjust the code with respect to:
  "shell32: Re-add support for expanding ALLUSERSPROFILE for backward compatibility."
  4a6855a575c02aa1569aab8b2e96720fc02f3f26 (Alexandre Julliard)

- "shell32: Avoid infinite loop in _SHExpandEnvironmentStrings."
  ceea5bda14ecf4c8ce262fc7ab88df49e500bc38 (Alexandre Julliard)

- "shell32: Assume that system directory always contains a drive letter."
  54530bc4933ae1014c3697c95e22b8ca5a275bc4 (Alexandre Julliard)

- "shell32: Use ARRAY_SIZE macro."
  612a1941331485725952d34f3dcd5866fc318dc2 (Nikolay Sivov)

- "shell32: Fix a trace message."
  bb09bb5750d617047aa23635731519a2f9486159 (Nikolay Sivov)

- "shell32: Fix SHGetFolderPathAndSubDir() trace message."
  f75d5625966933562b974540a3f29dfcd720ad50 (Nikolay Sivov)

- "shell32: Pass correct buffer length to RegQueryValueExW()."
  0bfb97dcba29552b51d8609fcc6e7bbc04bb8320 (Nikolay Sivov)

- "shell32: Remove unused string (Clang)."
  8d50a8a246960749afba21eac117b4fcbbf2c79d (André Hentschel)

- "shell32: Use E_NOT_SUFFICIENT_BUFFER definition."
  730e744e3bd6b706612fe0f90a7efb2e600f114f (Nikolay Sivov)