libweston: include weston-egl-ext.h in drm, x11 and wayland compositor

As to what is done for gl-renderer.c, weston-egl-ext.h should be
include in compositor-drm.c, compositor-x11.c and compositor-wayland.c.
This fix building issue with GPU that does not have EGL_PLATFORM_xxx_KHR
in their extension header file eglext.h.

Signed-off-by: Vincent Abriou <vincent.abriou@st.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>

libweston/compositor-drm.c

@@ -52,6 +52,7 @@
 #include "shared/helpers.h"
 #include "shared/timespec-util.h"
 #include "gl-renderer.h"
+#include "weston-egl-ext.h"
 #include "pixman-renderer.h"
 #include "libbacklight.h"
 #include "libinput-seat.h"

libweston/compositor-wayland.c

@@ -44,6 +44,7 @@
 #include "compositor.h"
 #include "compositor-wayland.h"
 #include "gl-renderer.h"
+#include "weston-egl-ext.h"
 #include "pixman-renderer.h"
 #include "shared/helpers.h"
 #include "shared/image-loader.h"

libweston/compositor-x11.c

@@ -56,6 +56,7 @@
 #include "shared/helpers.h"
 #include "shared/image-loader.h"
 #include "gl-renderer.h"
+#include "weston-egl-ext.h"
 #include "pixman-renderer.h"
 #include "presentation-time-server-protocol.h"
 #include "linux-dmabuf.h"