jio_snprintf and friends are not checked by -Wformat

[Thorsten Glaser]

Hi,

I would like to request a change to be added early in the next
development cycle, so we can test these on all kinds of platform
(64-bit with 64-bit time_t, 32-bit with both 32-bit and 64-bit
time_t).

https://bugs.java.com/bugdatabase/view_bug?bug_id=8198918 has
https://github.com/openjdk/jdk/pull/15918 listed, but that’s
incomplete (as I noted there): the ATTRIBUTE_PRINTF were removed
from prims/jvm.cpp (correct, as they are useless there) but not
added to prims/jvm.h where they’re needed for call sites checking.

Thanks,
//mirabilos
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