Makefile: add -Wsign-compare to warning options

Now that all signedness comparison warnings in the source tree have been
fixed, let's enable the warning option, to avoid them creeping in again.

Signed-off-by: Andre Przywara <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: David Gibson <[email protected]>
1 file changed
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