libXinerama: update to 1.1.5.

Alan Coopersmith (8):
      Update README for gitlab migration
      Update configure.ac bug URL for gitlab migration
      Build xz tarballs instead of bzip2
      Fix spelling/wording issues
      gitlab CI: add a basic build test
      XineramaQueryScreens: fix -Wsign-compare warning
      Remove "register" type qualifier from variable declarations
      libXinerama 1.1.5

(wiz)