The whole GCC kinda sucks around warnings, this is yet another place
where pragmas manipulating warnings don't work properly and thus a
warning has to be disabled globally... luckily, this time it is
happening in selftest file and thus it isn't too problematic to just
turn that warning of for the entire file.
Effectively a revert of previous commit, fixing #542, where this was
added to stop linters complaining about `REQUIRE_THROWS_AS` used like
`REQUIRE_THROWS_AS(expr, std::exception);`, which would be slicing the
caught exception. Now it is user's responsibility to pass us proper
exception type.
Closes#833 which wanted to add `typename`, so that the construct works
in a template, but that would not work with MSVC and older GCC's, as
having `typename` outside of a template is allowed only from C++11
onward.
