Segfault when loading OpenGL on Ubuntu Touch

[Semphriss]

I've observed a segfault when calling SDL_GL_LoadLibrary(NULL) on Ubuntu Touch (arm64). It also happens when attempting to create a window with SDL_WINDOW_OPENGL.

The crash happens at src/video/SDL_egl.c:450:

LOAD_FUNC_EGLEXT(PFNEGLQUERYDEVICESEXTPROC, eglQueryDevicesEXT);

With some debugging, eglGetProcAddress appears to be a valid pointer to a function, but when running that function, the stack becomes corrupted.

I can run other software that use EGL (Neverball), so I don't think the EGL library itself is corrupted.