glmark2: don't build full OpenGL backends by default
glmark2: don't build full OpenGL backends by default

Most embedded GPU's implementations OpenGL include only the OpenGL ES
APIs. Attempting to compile the {x11,wayland,drm}-gl variants of
GLMark fail in those cases.

Signed-off-by: Matt Hoosier <2abf897ea54d95d9ea7b0150cee1be7081b1030f@garmin.com>
Signed-off-by: Joshua Watt <a9203822f8e5fd5efed99f9b90edb711b0bebce2@gmail.com>
Signed-off-by: Khem Raj <729d64b6f67515e258459a5f6d20ec88b2caf8df@gmail.com>

rehsack/meta-openembedded,VCTLabs/meta-openembedded,VCTLabs/meta-openembedded,schnitzeltony/meta-openembedded,rehsack/meta-openembedded,openembedded/meta-openembedded,openembedded/meta-openembedded,openembedded/meta-openembedded,VCTLabs/meta-openembedded,rehsack/meta-openembedded,rehsack/meta-openembedded,moto-timo/meta-openembedded,openembedded/meta-openembedded,moto-timo/meta-openembedded,VCTLabs/meta-openembedded,rehsack/meta-openembedded,moto-timo/meta-openembedded,openembedded/meta-openembedded,schnitzeltony/meta-openembedded,moto-timo/meta-openembedded,openembedded/meta-openembedded,schnitzeltony/meta-openembedded,moto-timo/meta-openembedded,schnitzeltony/meta-openembedded,VCTLabs/meta-openembedded,rehsack/meta-openembedded,VCTLabs/meta-openembedded,openembedded/meta-openembedded,schnitzeltony/meta-openembedded,schnitzeltony/meta-openembedded,rehsack/meta-openembedded,openembedded/meta-openembedded,VCTLabs/meta-openembedded,schnitzeltony/meta-openembedded,VCTLabs/meta-openembedded