CMake: Fix typo in symbol names

I can't spell occurred:-/

Similar typos in 3rd party code (sqlite) has been left in place.

Change-Id: I7cfa9911fc434d42ce3df8e9c7ccb83dc00401e8
Reviewed-by: hjk <hjk@qt.io>

src/plugins/cmakeprojectmanager/fileapireader.cpp

@@ -258,7 +258,7 @@ void FileApiReader::endState(const QFileInfo &replyFi)
         if (value->errorMessage.isEmpty()) {
             emit this->dataAvailable();
         } else {
-            emit this->errorOccured(value->errorMessage);
+            emit this->errorOccurred(value->errorMessage);
         }
     });
 }