- update to release 0.3.9
* Mark DEPTH_MASK as Unsigned int
* Add autogen.sh to EXTRA_DIST.
* Follow changes in m4 submodule.
* config: add bug URL to AC_INIT
* config: replace deprecated use of AC_OUTPUT with AC_CONFIG_FILES
* config: use AC_CONFIG_HEADERS to create a config.h file
* config: remove old dead code for documentation
* config: add missing COPYING file
* make: use AM_CPPFLAGS rather than per-target libxcb_render_util_la_CPPFLAGS
* make: using EXTRA_DIST for xcb-renderutil.pc.in is redundant
* make: there should be no attempt to remove any Makefile.in file
* make: compile the library with standard xorg warning flags
* Fix compilation and linking issues with C++
* Check submodules before running autoconf.