Re: Add SHELL_EXIT_CODE to psql

Unfortunately, cirrus-ci still not happy
https://cirrus-ci.com/task/6502730475241472

[23:14:34.206] time make -s -j${BUILD_JOBS} world-bin
[23:14:43.174] psqlscanslash.l: In function ‘evaluate_backtick’:
[23:14:43.174] psqlscanslash.l:827:11: error: implicit declaration of
function ‘WIFSTOPPED’ [-Werror=implicit-function-declaration]
[23:14:43.174] 827 | exit_code = WSTOPSIG(close_exit_code);
[23:14:43.174] | ^~~~~~~~~~
[23:14:43.174] psqlscanslash.l:828:16: error: implicit declaration of
function ‘WSTOPSIG’ [-Werror=implicit-function-declaration]
[23:14:43.174] 828 |
[23:14:43.174] | ^
[23:14:43.174] cc1: all warnings being treated as errors

>
and on FreeBSD

[23:13:03.914] cc -o ...
[23:13:03.914] ld: error: undefined symbol: WEXITSTATUS
[23:13:03.914] >>> referenced by command.c:5036
(../src/bin/psql/command.c:5036)
[23:13:03.914] >>>
src/bin/psql/psql.p/command.c.o:(exec_command_shell_escape)
[23:13:03.914] cc: error: linker command failed with exit code 1 (use -v to
see invocation)

and on Windows

[23:19:51.870] meson-generated_.._psqlscanslash.c.obj : error LNK2019:
unresolved external symbol WIFSTOPPED referenced in function
evaluate_backtick
[23:19:52.197] meson-generated_.._psqlscanslash.c.obj : error LNK2019:
unresolved external symbol WSTOPSIG referenced in function evaluate_backtick
[23:19:52.197] src\bin\psql\psql.exe : fatal error LNK1120: 2 unresolved
externals

I belive, we need proper includes.

--
Best regards,
Maxim Orlov.