gpu-viv-bin-mx6q: new package

This patch adds a new package for the OpenGL, OpenVG and EGL
proprietary implementations specific to the Vivante GPU of i.MX6
processors.

[Peter: show comment on uClibc toolchains, tweak help text]
Signed-off-by: Henk Fijnvandraat <h.fijnvandraat@inter.nl.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>