...as they are often enough errors, like a typo in brace placement in

  if (foo == (FOO || bar == BAR) && baz)

or a literal true passed as an argument to a function that rather expects an
integer bit mask, etc.  The plugin is smart enough to detect interaction with
logically boolean return/parameter types of C functions that use [unsigned] int
instead, and knows the relevant boolean typedefs (sal_Bool, gboolean, etc.).

Change-Id: I5f0e4344fe86589bec35a71018c7effdedf85e3e