Log Message:
Update to 1.7.5:

A couple of important bugfixes that have accumulated over the last year.

Cosimo Cecchi (1):
      Fix version check in _XIAllowEvents

Julien Cristau (1):
      Advance the request buffer by the right amount in XIChangeHierarchy

Michal Srb (7):
      Fix double unlock when _XiCheckExtInit return -1.
      XIChangeHierarchy: Add missing unlock.
      Do not return NoSuchExtension casted to pointer as an error.
      XIGetClientPointer: Return False on error.
      Fix logic in _XIAllowEvents and prevent double unlock.
      Refactor XGetExtensionVersion.
      XIGrabDevice: Unlock display in error path.

Peter Hutterer (1):
      libXi 1.7.5