vrend_renderer.h: include epoxy/gl.h because it is actually needed here (v2)

v2: With epoxy GL/gl.h is not directly included (Dave Airlie).
    Instead move the include of epoxy/gl.h from vrend_renderer.c to
    vrend_renderer.h

Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Reviewed-by: Dave Airlie <airlied@redhat.com>

src/vrend_renderer.c

@@ -25,8 +25,6 @@
 #include "config.h"
 #endif
 
-#include <epoxy/gl.h>
-
 #include <unistd.h>
 #include <stdio.h>
 #include <errno.h>

src/vrend_renderer.h

@@ -30,6 +30,7 @@
 #include "virgl_protocol.h"
 #include "vrend_iov.h"
 #include "virgl_hw.h"
+#include <epoxy/gl.h>
 
 typedef void *virgl_gl_context;
 typedef void *virgl_gl_drawable;