docs/egl: Android platform can also be build using autotools
docs/egl: Android platform can also be build using autotools

We added support for Android build using autotools (configure),
update the documentation to reflect that.

Signed-off-by: Nicolas Boichat <f3daba1cdc403799935674d3cd4b0e5bd1804232@google.com>
Reviewed-by: Emil Velikov <f20878473f414da183da19ee25c8722cc1d711e4@collabora.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler