InputDriverRec: Resolve -Wmissing-field-initializers warning

void.c:222:1: warning: missing initializer for field ‘default_options’ of ‘InputDriverRec {aka struct _InputDriverRec}’ [-Wmissing-field-initializers]
 };
 ^
In file included from void.c:39:0:
/usr/include/xorg/xf86Xinput.h:83:18: note: ‘default_options’ declared here
     const char **default_options;
                  ^~~~~~~~~~~~~~~

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

src/void.c

@@ -213,12 +213,16 @@ xf86VoidInit(InputDriverPtr	drv,
 }
 
 _X_EXPORT InputDriverRec VOID = {
-    1,				/* driver version */
-    "void",			/* driver name */
-    NULL,			/* identify */
-    xf86VoidInit,		/* pre-init */
-    xf86VoidUninit,		/* un-init */
-    NULL,			/* module */
+    .driverVersion		= 1,
+    .driverName			= "void",
+    .Identify			= NULL,
+    .PreInit			= xf86VoidInit,
+    .UnInit			= xf86VoidUninit,
+    .module			= NULL,
+    .default_options		= NULL,
+#if GET_ABI_MAJOR(ABI_XINPUT_VERSION) >= 21
+    .capabilities		= 0
+#endif
 };
 
 /*