sync code with last improvements from OpenBSD

lib/libXext/include/X11/extensions/Xext.h

@@ -0,0 +1,53 @@
+/*
+ *
+Copyright 1989, 1998  The Open Group
+
+Permission to use, copy, modify, distribute, and sell this software and its
+documentation for any purpose is hereby granted without fee, provided that
+the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation.
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+Except as contained in this notice, the name of The Open Group shall not be
+used in advertising or otherwise to promote the sale, use or other dealings
+in this Software without prior written authorization from The Open Group.
+ */
+
+#ifndef _XEXT_H_
+#define _XEXT_H_
+
+#include <X11/Xfuncproto.h>
+
+_XFUNCPROTOBEGIN
+
+typedef int (*XextErrorHandler) (
+    Display *		/* dpy */,
+    _Xconst char*	/* ext_name */,
+    _Xconst char*	/* reason */
+);
+
+extern XextErrorHandler XSetExtensionErrorHandler(
+    XextErrorHandler	/* handler */
+);
+
+extern int XMissingExtension(
+    Display*		/* dpy */,
+    _Xconst char*	/* ext_name */
+);
+
+_XFUNCPROTOEND
+
+#define X_EXTENSION_UNKNOWN "unknown"
+#define X_EXTENSION_MISSING "missing"
+
+#endif /* _XEXT_H_ */