qmljs: add libPath utility method

Change-Id: Ie99d3cbff602e38418faeda565526793089a543c
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>

src/libs/qmljs/qmljsimportdependencies.h

@@ -108,6 +108,7 @@ public:
     int minorVersion;
 
     QString path() const;
+    QString libPath() const;
 
     void addToHash(QCryptographicHash &hash) const;
     ImportKey flatKey() const;