Utils: Fix compile with MinGW

Amends fbb8d94e55.

Change-Id: Ib62733031bfed435592da57d7f52e10473953669
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/libs/utils/filepath.cpp

@@ -1995,6 +1995,11 @@ QTCREATOR_UTILS_EXPORT size_t qHash(const FilePath &filePath, uint seed)
     return qHash(filePath.path(), seed);
 }
 
+QTCREATOR_UTILS_EXPORT size_t qHash(const FilePath &filePath)
+{
+    return qHash(filePath, 0);
+}
+
 QTCREATOR_UTILS_EXPORT QDebug operator<<(QDebug dbg, const FilePath &c)
 {
     return dbg << c.toString();