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

.color_coded.in

+-I@abs_top_builddir@
+-I@abs_top_srcdir@
+-I@abs_top_builddir@/gnulib/lib
+-I@abs_top_srcdir@/gnulib/lib
+-I@abs_top_builddir@/include
+-I@abs_top_srcdir@/include
+-I@abs_top_builddir@/src
+-I@abs_top_srcdir@/src
+-I@abs_top_builddir@/src/access
+-I@abs_top_srcdir@/src/access
+-I@abs_top_builddir@/src/admin
+-I@abs_top_srcdir@/src/admin
+-I@abs_top_builddir@/src/bhyve
+-I@abs_top_srcdir@/src/bhyve
+-I@abs_top_builddir@/src/conf
+-I@abs_top_srcdir@/src/conf
+-I@abs_top_builddir@/src/libxl
+-I@abs_top_srcdir@/src/libxl
+-I@abs_top_builddir@/src/locking
+-I@abs_top_srcdir@/src/locking
+-I@abs_top_builddir@/src/logging
+-I@abs_top_srcdir@/src/logging
+-I@abs_top_builddir@/src/lxc
+-I@abs_top_srcdir@/src/lxc
+-I@abs_top_builddir@/src/qemu
+-I@abs_top_srcdir@/src/qemu
+-I@abs_top_builddir@/src/remote
+-I@abs_top_srcdir@/src/remote
+-I@abs_top_builddir@/src/rpc
+-I@abs_top_srcdir@/src/rpc
+-I@abs_top_builddir@/src/secret
+-I@abs_top_srcdir@/src/secret
+-I@abs_top_builddir@/src/security
+-I@abs_top_srcdir@/src/security
+-I@abs_top_builddir@/src/util
+-I@abs_top_srcdir@/src/util
+-I@abs_top_builddir@/src/vmx
+-I@abs_top_srcdir@/src/vmx
+-I@abs_top_builddir@/src/xenconfig
+-I@abs_top_srcdir@/src/xenconfig

.gitignore

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

configure.ac

@@ -882,6 +882,7 @@ AC_CONFIG_FILES([\
         Makefile src/Makefile include/libvirt/Makefile docs/Makefile \
         gnulib/lib/Makefile \
         gnulib/tests/Makefile \
+        .color_coded \
         libvirt.pc \
         libvirt-qemu.pc \
         libvirt-lxc.pc \