Moving relevant tests to corelib/codecs

Task-number: QTBUG-21066

Change-Id: If33bda9622bbfdac2b72ec2bf8489b0f62bae6e2
Reviewed-on: http://codereview.qt.nokia.com/3469
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Sergio Ahumada <sergio.ahumada@nokia.com>
Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>
Reviewed-by: Jason McDonald <jason.mcdonald@nokia.com>

tests/auto/corelib/codecs/codecs.pro

@@ -0,0 +1,3 @@
+TEMPLATE=subdirs
+SUBDIRS=\
+   qtextcodec

tests/auto/corelib/corelib.pro

@@ -1,3 +1,4 @@
 TEMPLATE=subdirs
 SUBDIRS=\
-   animation
+   animation \
+   codecs

tests/auto/gui.pro

@@ -167,7 +167,6 @@ SUBDIRS=\
     qtablewidget \
     qtcpsocket \
     qtextblock \
-    qtextcodec \
     qtextcursor \
     qtextdocumentfragment \
     qtextdocumentlayout \