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Do not alter the C standard when building with `--enable-warnings` when building with gcc. On one hand this alters warning results compared to a default build. On the other, it may produce different binaries, which is unexpected. Also fix new warnings that appeared after removing `-std=gnu89`: - include: fix public curl headers to use the correct printf mask for `CURL_FORMAT_CURL_OFF_T` and `CURL_FORMAT_CURL_OFF_TU` with mingw-w64 and Visual Studio 2013 and newer. This fixes the printf mask warnings in examples and tests. E.g. [1] - conncache: fix printf format string [2]. - http2: fix potential null pointer dereference [3]. (seen on Slackware with gcc 11.) - libssh: fix printf format string in SFTP code [4]. Also make MSVC builds compatible with old CRT versions. - libssh2: fix printf format string in SFTP code for MSVC. Applying the same fix as for libssh above. - unit1395: fix `argument is null` and related issues [5]: - stop calling `strcmp()` with NULL to avoid undefined behaviour. - fix checking results if some of them were NULL. - do not pass NULL to printf `%s`. - ci: keep a build job with `-std=gnu89` to continue testing for C89-compliance. We can apply this to other gcc jobs as needed. Ref: b23ce2cee7329bbf425f18b49973b7a5f23dfcb4 (2022-09-23) #9542 [1] https://dev.azure.com/daniel0244/curl/_build/results?buildId=18581&view=logs&jobId=ccf9cc6d-2ef1-5cf2-2c09-30f0c14f923b [2] https://github.com/curl/curl/actions/runs/6896854263/job/18763831142?pr=12346#step:6:67 [3] https://github.com/curl/curl/actions/runs/6896854253/job/18763839238?pr=12346#step:30:214 [4] https://github.com/curl/curl/actions/runs/6896854253/job/18763838007?pr=12346#step:29:895 [5] https://github.com/curl/curl/actions/runs/6896854253/job/18763836775?pr=12346#step:33:1689 Closes #12346