Add symbol versioning for find_directory()

Should already have been done back when the semantics for the
B_COMMON_*DIRECTORY constants was changed.

Currently old and new version behave the same. So this is just a
contingency measure ATM.

headers/private/system/find_directory_private.h

@@ -0,0 +1,24 @@
+/*
+ * Copyright 2013, Ingo Weinhold, [email protected].
+ * Distributed under the terms of the MIT License.
+ */
+#ifndef _SYSTEM_FIND_DIRECTORY_PRIVATE_H
+#define _SYSTEM_FIND_DIRECTORY_PRIVATE_H
+
+
+#include <sys/cdefs.h>
+
+#include <FindDirectory.h>
+
+
+__BEGIN_DECLS
+
+
+status_t __find_directory(directory_which which, dev_t device, bool createIt,
+	char *returnedPath, int32 pathLength);
+
+
+__END_DECLS
+
+
+#endif	/* _SYSTEM_FIND_DIRECTORY_PRIVATE_H */