patch 8.0.0077

Problem:    The GUI code is not tested by Travis.
Solution:   Install the virtual framebuffer.

.travis.yml

@@ -69,6 +69,12 @@ before_install:
     # Lua is not installed on Travis OSX
   - if [ "$TRAVIS_OS_NAME" = "osx" ]; then brew install lua; export LUA_PREFIX=/usr/local; fi
 
+# Start virtual framebuffer to be able to test the GUI.
+before_script:
+  - "export DISPLAY=:99.0"
+  - "sh -e /etc/init.d/xvfb start"
+  - sleep 3 # give xvfb some time to start
+
 script:
   - NPROC=$(getconf _NPROCESSORS_ONLN)
   - if [ "$CHECK_AUTOCONF" = "yes" -a "$CC" = "gcc" ]; then make -C src autoconf; fi

src/version.c

@@ -764,6 +764,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    77,
 /**/
     76,
 /**/