...as MSVC would warn about those anyway (at least about cases that do not
compare against literal sal_True/sal_False, but warning even about those helped
clean up lots of redundant

  if (foo == true)

instead of just

  if (foo)

etc. across the code base).

Change-Id: Iad4b335c35c5411070f04f87f974db7942c288d4