When using the cross-compiler toolchain for 32 bit on a 64 bit machine,
qmake generated a 64 bit VS project.
This was because qmake didn't know about the amd64_x86 cross-compiler,
and qmake did not use the first MSVC bin directory it found in PATH.
Task-number: QTBUG-43457
Change-Id: I50c6f7bb9afe44a58321c670d680dbcc7cd07223
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>