wayland/buffer: drop unused GLESv3 include

That one is often in a separate Mesa package and contrary to GLESv2
doesn’t come with a pkg-config file. Mildly annoying…

src/wayland/buffer/dmabuf.cpp

@@ -10,7 +10,6 @@
 #include <EGL/egl.h>
 #include <EGL/eglext.h>
 #include <GL/gl.h>
-#include <GLES3/gl32.h>
 #include <fcntl.h>
 #include <gbm.h>
 #include <libdrm/drm_fourcc.h>