The version of GLEW being used is 1.13 (LibreELEC.tv/package.mk at master · LibreELEC/LibreELEC.tv · GitHub)
GLEW 2.1 has been out for almost a year (Releases · nigels-com/glew · GitHub). Would it be possible to upgrade?
GLEW 2.0 added support for EGL. There is a patch in the projectm project to remove GLEW, libprojectm-hacky-removal-of-glew-spiff.patch, because of GLEW and EGL didn't work together: visualization.projectm from git crashes.
Might be able to upgrade GLEW and remove that patch?