Move the global `-Wno-format` compiler option to the individual tests
that still trigger Wformat warnings. The majority of the tests now
compile cleanly with `-Wformat` enabled.
Signed-off-by: Sven van Haastregt <sven.vanhaastregt@arm.com>
Only disable `-Wsign-compare` for tests that do not compile cleanly
with this warning enabled. Re-enable the warning for the other tests,
so that it can catch any new occurrences.
Signed-off-by: Sven van Haastregt <sven.vanhaastregt@arm.com>
