qmake/vcxproj: fix parsing of /RTC* options

/RTCsu and /RTCus must be handled as full runtime check options.

Task-number: QTBUG-30711

Change-Id: I783bf49f2ab1d4fd9636dca8e434bccb54844c8c
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
(cherry picked from commit 3c62f4d0c65f1a60bd8d4e6b985d79cb0aa8342b)
qmake/vcxproj: resurrect support for /we compiler switch

The vcxproj format supports the /we compiler switch as
TreatSpecificWarningsAsErrors tag.
Support for this switch got lost during refactoring of the
vc(x)proj generators for Qt 4.8.0.

Task-number: QTBUG-29098

Change-Id: I607e907dcb9c1bc7d261053b6d757941ec7db822
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
(cherry picked from commit a3d1d41d1d88b989fe7c460ef32b4f8606aafe0c)
Disabling largefile support for WinCE.

This was disabled before, but
2bba0eadc1570f29331285738b9d319687f84d4c
enabled it per default.

Change-Id: Ic5a8e50d116cf6b15719668faf055967a6f34e06
(cherry picked from commit 45750b18187ef257a986cf6ab8b2c97ef3ba6e52)
Reviewed-by: Andreas Holzammer <andreas.holzammer@kdab.com>
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@digia.com>
Reviewed-by: Björn Breitmeyer <bjoern.breitmeyer@kdab.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>