Minimal qbs build mode

Change-Id: I1f5b03c04d9b05e14c9e0e44eb98882369240b25
qbs: Fix link warning

for targeting xp 64bit, it's should be 5.2 (5.02)

LINK : warning LNK4010: invalid subsystem version number 5.01;
default subsystem version assumed

Change-Id: I8683a70148208ff399c6dfe3bd299b6b81206e32
Add /FS to cpp.platformC(xx)Flags for MSVC2013

Task-number: QTCREATORBUG-11025
Change-Id: Ibdfebc601a38535aae353a0ed2aedac920d5b192
Fix minimum windows version detection

Change-Id: Idba2e5ec81bae1572e6ed8f89055e8bf1ab41ba1