Inital version of thunks generation script for EGL/GLES proxy libs

We can provide small proxy shared libraries for EGL/GLESv1/GLESv2
and decide at runtime which variants of the blob drivers need to
be loaded to do the real job.

Yes, this smells kinda like libhybris, but there seems to be no
better option to take care of all the quirks in the r3p0 and r3p2
mali400 blobs. And more importantly, allow to switch between
r3p0 and r3p2 mali drivers by just replacing the kernel (no
changes in the userspace required).

Signed-off-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>
And add the autogenerated thunks for EGL/GLES proxy libs

Using the ruby script and objdump, a common subset of global
functions provided by mesa and mali blobs can be easly
identified. And the necessary thunks are generated. They
can be later used by the dlopen based proxy libraries.

Signed-off-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>