Are EGL libraries automatically loaded?
I'm using glad_egl in an application. If I don't link with EGL during the build I get the runtime error:
 `undefined symbol: eglGetProcAddress`

After looking in the `glad_egl.c` I found that it didn't have the dlopen/dlsym calls that I would expect and that `glad.c` has.

For details please see: https://github.com/bulletphysics/bullet3/pull/1565#pullrequestreview-98795159