mel.conf: include qt5-mel.conf

Include qt5-mel.conf to mel.conf and remove the qtwebkit
PACKAGECONFIG changes to qt5-mel.conf.

Signed-off-by: Sujith H <Sujith_Haridasan@mentor.com>
Merge pull request #194 from sharidas/qt5-mel-conf

mel.conf: include qt5-mel.conf