Get rid of xcb-util-xrm

.travis.yml

@@ -60,13 +60,6 @@ before_install:
 
 install:
   - sudo gem install asciidoctor
-  - |
-    # Install xcb-util-xrm.
-    set -e
-    (git clone --depth 1 --recursive https://github.com/Airblader/xcb-util-xrm.git /tmp/xcb-util-xrm
-     cd /tmp/xcb-util-xrm
-     ./autogen.sh --prefix=/usr
-     make && sudo make install)
 
   - |
     (echo '#!/bin/sh' ; echo 'set -x' ; echo 'gcc -shared -Wl,--no-undefined -o "$@" -ldl -lm') > /tmp/myar