Change mingw47 build to mingw491 and forcesuccess

Change-Id: I04c18114324e76ef1cc76fa18015ae22afcbfe82
Reviewed-by: Heikki Halmet <heikki.halmet@theqtcompany.com>
Reviewed-by: Simo Fält <simo.falt@theqtcompany.com>
Remove qtlibinfix build on Ubuntu 11.10 x64

Need to bring down the amount of configurations we run.
Libinfix is covered by RHEL builds. Also changes
revdep configuration to not inherit the configuration
being removed.

Change-Id: Ie9cd225c2a7839c02c7be71369476376a12f6d6c
Reviewed-by: Simo Fält <simo.falt@theqtcompany.com>