qmake does unneccessary dependency analysis when creating VCPROJ files

qmake always scans all include files of *.cpp and *.ui files.

QMakeSourceFileInfo::addSourceFiles is always called with SEEK_DEPS set, so that even when this depends information is not needed for the VCPROJ XML files (because they do not contain depends information, in contrast to Makefiles).

When disabling SEEK_DEPS for the VCPROJ runs, my QMake ran 3x times faster, most time was spend searching for include files and parsing the Cpp files unnecessarily.

Please make it configureable to disable SEEK_DEPS via a QMAKE_XXX variable and set this variable in the VCPROJ MAKESPECS to disable the behaviour for the VCPROJ creation.