libX11: update to 1.7.1.

Benno Schulenberg (3):
      nls: add 'C.utf8' as an alias for 'en_US.UTF-8'
      nls: allow composing all breved letters also with a lowercase "u"
      nls: adjust three comments about the APL compose sequences

Christopher Chavez (1):
      Xlib.h: spelling fix in comment

Gaurav Ujjwal (1):
      Fix out-of-bound access in KeySymToUcs4()

Matthieu Herrb (2):
      Reject string longer than USHRT_MAX before sending them on the wire
      Version 1.7.1

Walter Harms (8):
      FIX: warning: macro `Pn' not defined
      FIX: warning: macro `hN' not defined
      fix warning: macro `s' not defined
      FIX: warning: macro `IN' not defined
      FIX: warning: macro `hN' not defined
      fix broken nroff coding for code comments
      Fix some roff code add see also
      fix same roff code

(wiz)