Обсуждение: pgsql: Use -Wno-format-truncation and -Wno-stringop-truncation,if avai

Use -Wno-format-truncation and -Wno-stringop-truncation, if available.

gcc 8 has started emitting some warnings that are largely useless for
our purposes, particularly since they complain about code following
the project-standard coding convention that path names are assumed
to be shorter than MAXPGPATH.  Even if we make the effort to remove
that assumption in some future release, the changes wouldn't get
back-patched.  Hence, just suppress these warnings, on compilers that
have these switches.

Backpatch to all supported branches.

Discussion: https://postgr.es/m/1524563856.26306.9.camel@gunduz.org

Branch
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REL9_3_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/ec5547e563a85cb84fc186dd96c41a86c59cc7fa

Modified Files
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configure    | 130 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
configure.in |  12 ++++++
2 files changed, 142 insertions(+)