[tracker] Fixes after review for Qt5 port

[Philip Van Hoof <pvanhoof src gnome org>]

commit 8b3b8fe8da4c72cb4afda9805b70bd26ca9743f2
Author: Philip Van Hoof <philip codeminded be>
Date:   Thu Jan 9 10:19:27 2014 +0100

    Fixes after review for Qt5 port

 src/tracker-extract/tracker-media-art-qt.cpp |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/src/tracker-extract/tracker-media-art-qt.cpp b/src/tracker-extract/tracker-media-art-qt.cpp
index ab220c4..47a3ef5 100644
--- a/src/tracker-extract/tracker-media-art-qt.cpp
+++ b/src/tracker-extract/tracker-media-art-qt.cpp
@@ -48,7 +48,7 @@ G_BEGIN_DECLS
 
 #ifdef HAVE_QT5
 static QGuiApplication *app = NULL;
-#else
+#else /* HAVE_QT4 */
 static QApplication *app = NULL
 #endif
 
@@ -61,11 +61,11 @@ tracker_media_art_plugin_init (void)
 #ifdef HAVE_QT5
 
 #ifdef HAVE_NEMO
-       setenv("QT_QPA_PLATFORM", "minimal", 1);
+       g_setenv("QT_QPA_PLATFORM", "minimal", 1);
 #endif
 
        app = new QGuiApplication (argc, argv);
-#else
+#else /* HAVE_QT4 */
        app = new QApplication (argc, argv, QApplication::Tty);
 #endif
 }