Log Message:
Update to 7.0.28:

Adds support for up to 512 clients in the X server.  Also a warning fix
for C99 compilers, and a build fix for Darwin.

Adam Jackson (1):
      xproto 7.0.28

Jeremy Huddleston Sequoia (1):
      darwin: Include strings.h

Olivier Fourdan (1):
      Increase the number of file descriptors

Thomas Klausner (1):
      Use C99 compliant definition of nonnull attribute.