Log Message:
Fix various installation and build issues.

o Add a lost hunk of patches/patch-ac in order to build and install \ 
"mupdf-x11"
  simply as "mupdf" (like previous mupdf releases)
o Threat glfw like any other thirdparty library (and avoid to accidently build
  "mupdf-gl")

Thanks to Thomas Klausner and Yorick Hardy for noticing that.