egl: Fix inclusion of egl.h+mesa_glinterop.h

Previously clang would warn about redefinition of typedef EGLDisplay. Avoid
this by adding preprocessor guards to mesa_glinterop.h and including it
after EGL.h is indirectly included.

Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

include/GL/mesa_glinterop.h

@@ -58,12 +58,16 @@ extern "C" {
 #endif
 
 /* Forward declarations to avoid inclusion of GL/glx.h */
+#ifndef GLX_H
 struct _XDisplay;
 struct __GLXcontextRec;
+#endif
 
 /* Forward declarations to avoid inclusion of EGL/egl.h */
+#ifndef __egl_h_
 typedef void *EGLDisplay;
 typedef void *EGLContext;
+#endif
 
 /** Returned error codes. */
 enum {

src/egl/drivers/dri2/egl_dri2.c

@@ -46,7 +46,6 @@
 #endif
 #include <GL/gl.h>
 #include <GL/internal/dri_interface.h>
-#include "GL/mesa_glinterop.h"
 #include <sys/types.h>
 #include <sys/stat.h>
 
@@ -61,6 +60,7 @@
 #endif
 
 #include "egl_dri2.h"
+#include "GL/mesa_glinterop.h"
 #include "loader/loader.h"
 #include "util/u_atomic.h"
 #include "util/u_vector.h"

src/egl/main/eglapi.c

@@ -88,7 +88,6 @@
 #include <string.h>
 #include "c99_compat.h"
 #include "c11/threads.h"
-#include "GL/mesa_glinterop.h"
 #include "util/macros.h"
 
 #include "eglglobals.h"
@@ -102,6 +101,7 @@
 #include "eglimage.h"
 #include "eglsync.h"
 
+#include "GL/mesa_glinterop.h"
 
 /**
  * Macros to help return an API entrypoint.