Add extutilP.h header for xgeExtRegister() prototype

Clears gcc warning:

Xge.c:302:11: warning: no previous prototype for ‘xgeExtRegister’
 [-Wmissing-prototypes]
 _X_HIDDEN xgeExtRegister(Display* dpy, int offset, XExtensionHooks* callbacks)
           ^~~~~~~~~~~~~~

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/Xge.c b/src/Xge.c
index f1af16a..2b97743 100644
--- a/src/Xge.c
+++ b/src/Xge.c
@@ -39,6 +39,8 @@
 #include <X11/extensions/extutil.h>
 #include <X11/extensions/Xge.h>
 
+#include "extutilP.h"
+
 /***********************************************************************/
 /*                    internal data structures                         */
 /***********************************************************************/