tst_toolsupport::offsets(QFilePrivate::fileName) fails on x32 ABI

It seems like on x32 ABI (the x86_64 instructions with 32bit pointers) alignment rules are same as on regular 64 bit apps.

FAIL!  : tst_toolsupport::offsets(QFilePrivate::fileName) Compared values are not the same
  Actual   (actual): 300
  Expected (expect): 264
  Loc: [/root/b/tst_toolsupport.cpp(67)]

Fix is attached, however, a long comment on top of that test file that I'm not sure how to handle:

//
// Note:
//
// When this test here fails and the change leading to the failure
// intentionally changed a private class, adjust the test here and bump
// the TypeInformationVersion field in src/corelib/global/qhooks.cpp
// in the same commit as the modification to the private class.
//
// Please also notify downstream users of the information checked here
// such as Qt Creator developers, of such a change by putting them
// on Cc: on the respective change on gerrit.
//