FindOpenGL: look for GLVND libraries with a libglvnd suffix
On CentOS 6.10, the libglvnd package from EPEL installs its libraries under a libglvnd subdirectory.
Here's the list of files contained within the package:
# rpm -ql libglvnd-devel
/usr/lib64/libGLdispatch.so
/usr/lib64/libOpenGL.so
/usr/lib64/libglvnd/libEGL.so
/usr/lib64/libglvnd/libGL.so
/usr/lib64/libglvnd/libGLESv1_CM.so
/usr/lib64/libglvnd/libGLESv2.so
/usr/lib64/libglvnd/libGLX.so
Cc: @tfogal @brad.king
Edited by Ben Boeckel