apitrace: new package

Trace and replay OpenGL and OpenGL ES APIs calls to/from a file.

http://apitrace.github.io/



[Peter: fix Config.in, depend on glibc, use github helper]
Signed-off-by: Jérôme Pouiller <jezz@sysmic.org>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>