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e8e6bc2c50
Note: On Linux with glibc, ISO mode also requires setting
the `_DEFAULT_SOURCE` macro to enable necessary POSIX features when
building tests (for `popen()`, `pclose()` and examples (for `fileno()`,
`tcsetattr()`). On other platforms and environments it may require
something else.
- replace `strdup()` with local implementation.
- replace `getline()` with C89 `fgets()`.
- replace `u_char`, `u_int` with C89 types.
- fix type mismatches in chacha-poly1305 code.
- silence `-Wno-format-nonliteral` locally. The global method was not
effective (like because it was overridden by `-Wformat=2`) and caused
these warnings when building in C89 mode.
- GHA: test ISO C89 in zlib-enabled Linux jobs with all crypto backends.
- fix formatting nits along the way.
- configure, cmake: silence silly `-Wno-comma` warnings with clang in
C89 mode.
- examples: include `select.h` again, where `select()` is used. As its
canonical header. Seen required on Linux glibc non-GNU/ISO builds.
Follow-up to a683133dfe #999
Assisted-by: Raul Tambre
Ref: #1674
Closes #1688