Use ck_warner() more

[ilmari]

Replace trivial uses of

if(ckWARN(WARN_FOO))
    warner(packWARN(WARN_FOO), ...);

with

ck_warner(packWARN(WARN_FOO), ...);

This does mean that the format string arguments get evaluated even if the warning category isn't enabled, but the most expensive thing I could see was Strerror(), which I woudn't worry about.

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• This set of changes does not require a perldelta entry.

[jkeenan]

I am reluctant to change so many files in the guts at this late point in the 5.41 dev cycle. I recommend that it be marked 'defer-next-dev' and taken up in the 5.43 cycle.

[ilmari]

I don't see how "number of files" is a useful metric for the riskiness of a change. This is a very low-risk change, it just replaces the manual if (...) warner(...) calls with a function that checks the same condition.