os: unexport xstrtokenize()

Not used by any external drivers/modules, so no need to keep it public.
Since modesetting is using it, still needs _X_EXPORT, as long as it's
a module.

Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>

test/input.c

@@ -38,6 +38,7 @@
 #include "dix/exevents_priv.h"
 #include "dix/input_priv.h"
 #include "mi/mi_priv.h"
+#include "os/fmt.h"
 
 #include "misc.h"
 #include "resource.h"