Fix XQuartz build

Fix XQuartz build since commit e036cbfc "Make PseudoramiXExtensionInit()
prototype more generally available"

Add #include "nonsdk_extinit.h" to xprScreen.c

Add #include "nonsdk_extinit.h" to miinitext.c under INXQUARTZ to provide
declarations used under INXQUARTZ

Signed-off-by: Jon Turney <jon.turney@dronecode.org.uk>
Reviewed-by: Jeremy Huddleston Sequoia <jeremyhu@apple.com>
Tested-by: Jeremy Huddleston Sequoia <jeremyhu@apple.com>
Signed-off-by: Keith Packard <keithp@keithp.com>

hw/xquartz/xpr/xprScreen.c

@@ -54,6 +54,8 @@
 #include "damage.h"
 #endif
 
+#include "nonsdk_extinit.h"
+
 #if MAC_OS_X_VERSION_MIN_REQUIRED < 1090
 // From NSApplication.h
 extern const double NSAppKitVersionNumber;

mi/miinitext.c

@@ -108,6 +108,9 @@ SOFTWARE.
 #include "misc.h"
 #include "extension.h"
 #include "extinit.h"
+#ifdef INXQUARTZ
+#include "nonsdk_extinit.h"
+#endif
 #include "micmap.h"
 #include "globals.h"