Log Message:
Update x11/libxcb to 1.11.1:

there is a new minor version of libxcb available. This fixes some
threading-related bugs with xcb_wait_for_special_event() and adds
64-bit versions of functions that work with sequence numbers.

Changes:

Christian Linhart (1):
      expose 64-bit sequence numbers for XLib

Michel Dänzer (1):
      Call _xcb_wake_up_next_reader from xcb_wait_for_special_event

Uli Schlachter (2):
      Fix a thread hang with xcb_wait_for_special_event()
      Release libxcb 1.11.1