Don't directly link to libGL from the EGL/KMS platform
Don't directly link to libGL from the EGL/KMS platform

The KMS platform accesses all of it's GL symbols via the indirection
through the Cogl context so there is no need to link against it
directly. This helps when trying to use Cogl with GLES where pulling
in Xlib via libGL is potentially a problem.

Reviewed-by: Robert Bragg <12e9293ec6b30c7fa8a0926af42807e929c1684f@linux.intel.com>

gcampax/cogl,Distrotech/cogl,djdeath/cogl-android,djdeath/cogl,djdeath/cogl-android,gcampax/cogl,gcampax/cogl,gcampax/cogl,djdeath/cogl,Distrotech/cogl,djdeath/cogl-android,Distrotech/cogl,djdeath/cogl,Distrotech/cogl