fix noDamageExtension warning in Xprint/Init.c

Also took out duplicate definition of this variable in mi/miinitext.c

Xprint/Init.c

@@ -308,10 +308,7 @@ void PrinterInitGlobals(void)
      * https://bugs.freedesktop.org/show_bug.cgi?id=1660) ...
      * (you can enable the DAMAGE extension explicitly via
      * % X +extension DAMAGE ... #) ;-( */
-    {
-      extern Bool noDamageExtension;
-      noDamageExtension = TRUE;
-    }
+    noDamageExtension = TRUE;
 #endif /* DAMAGE */
 
 #ifdef SMART_SCHEDULE

mi/miinitext.c

@@ -85,6 +85,7 @@ SOFTWARE.
 #include "misc.h"
 #include "extension.h"
 #include "micmap.h"
+#include "globals.h"
 
 #if defined(QNX4) /* sleaze for Watcom on QNX4 ... */
 #undef GLXEXT
@@ -125,9 +126,6 @@ extern Bool noBigReqExtension;
 #ifdef COMPOSITE
 extern Bool noCompositeExtension;
 #endif
-#ifdef DAMAGE
-extern Bool noDamageExtension;
-#endif
 #ifdef DBE
 extern Bool noDbeExtension;
 #endif