[dmlab_connect, egl_glimp] Unload graphics-related modules when the environment is destroyed.

In simply-linked applications, the graphics modules merely leave "still reachable" allocations behind. But when we load and unload the engine via the DSO loader, those allocations become actual leaks, so there is some value in minimizing them.

Author: tkoeppe

engine/code/deepmind/dmlab_connect.c

@@ -34,6 +34,7 @@
 #include "../qcommon/q_shared.h"
 #include "../qcommon/qcommon.h"
 #include "../renderercommon/qgl.h"
+#include "../renderercommon/tr_common.h"
 #include "../sys/sys_local.h"
 
 static const double kPixelsPerFrameToDegreesPerMilliseconds = 0.11 * 60 / 1000;
@@ -1128,6 +1129,7 @@ static void dmlab_destroy_context(void* context) {
   free(gc->image_buffer);
   free(gc);
   DMLabUnloadIOQ3Module();
+  GLimp_Shutdown();
 }
 
 static void call_add_score(int player_id, double score) {

engine/code/deepmind/headless_egl_glimp.c

@@ -99,4 +99,5 @@ void GLimp_Shutdown(void) {
   CHECK_EGL_SUCCESS(eglDestroySurface(egl_display, egl_surface));
   CHECK_EGL_SUCCESS(eglDestroyContext(egl_display, egl_context));
   CHECK_EGL_SUCCESS(TerminateInitializedEGLDisplay(egl_display));
+  ShutDownEGLSubsystem();
 }