scripted-diff: Convert global Mutexes to GlobalMutexes

-BEGIN VERIFY SCRIPT-
sed -i -E -e '/^([a-z]+ )?Mutex [a-z]/ s/Mutex/GlobalMutex/' $(git grep -lE '^([a-z]+ )?Mutex [a-z]')
-END VERIFY SCRIPT-

src/util/system.cpp

@@ -96,7 +96,7 @@ const char * const BITCOIN_SETTINGS_FILENAME = "settings.json";
 ArgsManager gArgs;
 
 /** Mutex to protect dir_locks. */
-static Mutex cs_dir_locks;
+static GlobalMutex cs_dir_locks;
 /** A map that contains all the currently held directory locks. After
  * successful locking, these will be held here until the global destructor
  * cleans them up and thus automatically unlocks them, or ReleaseDirectoryLocks