Add color_coded support

color_coded[1] is a vim plugin that implements semantic
syntax highlighting using libclang.

For non-trivial projects such as libvirt, the plugin needs
some help figuring out where to find the various header
files: generate its configuration file at configure time
so that the plugin works out of the box.

[1] https://github.com/jeaye/color_coded

.gitignore

@@ -26,6 +26,7 @@
 *.swp
 *~
 .#*
+.color_coded
 .deps
 .dirstamp
 .gdb_history