Add -Wformat-type-confusion to catch a wider range of format string errors #7993
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This is supported by clang, not gcc, hence adding this only to the
clang cflags in the strict warnings config.
lwip triggers this warning a lot, so we disable it there.
Fixes #7935
Problem
#7935 (but more broadly, some compiler configurations fail warnings that we don't have enabled by default in the tree).
Change overview
Enable stricter warnings.
Testing
Made sure all our CI compiles work.