package/glslsandbox-player: new package

package/glslsandbox-player: new package

GLSL Sandbox standalone player allow one to run and render
(most of) nice shaders available online on the
http://glslsandbox.com/ website, but without the need of an
Internet connection, a web browser or any of its
dependencies. Instead, the only requirement of
glslsandbox-player is a working EGL and GLESv2 libraries.

This package is useful for stressing and testing GLES shader
compiler in GPU drivers.

https://github.com/jolivain/glslsandbox-player

Signed-off-by: Julien Olivain <juju@cotds.org>
[Arnout: add dependency on threads and make BUSYBOX_SHOW_OTHERS
 conditional]
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>