updating manywarnings.m4?

[Philipp Stephani]

Hi,

I've noticed that the warnings list in manywarnings.m4 misses some
newer warnings, e.g. -Wint-in-bool-context. Is that intentional?
Should the list be updated regularly?
I've also tried comparing the list as described in the shell snippet
above (line 106), but that fails because the file
build-aux/gcc-warning.spec isn't present.

Thanks,
Philipp