Add LIBS-paths to PATH before running on windows.

On windows when linking to a library via -L/some/path, the library is
found in /some/path while linking. But running that app fails, since it
can't find the library. We now adjust PATH to include all paths from
LIBS and thus the library is found.

src/plugins/qt4projectmanager/qt4runconfiguration.cpp

@@ -550,6 +550,16 @@ ProjectExplorer::Environment Qt4RunConfiguration::baseEnvironment() const
     if (m_isUsingDyldImageSuffix) {
         env.set("DYLD_IMAGE_SUFFIX", "_debug");
     }
+
+#ifdef Q_OS_WIN
+    // On windows the user could be linking to a library found via a -L/some/dir switch
+    // to find those libraries while actually running we explicitly prepend those
+    // dirs to the path
+    Qt4ProFileNode *node = qt4Target()->qt4Project()->rootProjectNode()->findProFileFor(m_proFilePath);
+    if (node)
+        foreach(const QString dir, node->variableValue(LibDirectoriesVar))
+            env.prependOrSetPath(dir);
+#endif
     return env;
 }