tool: improve --stderr handling
- freopen stderr with the user-specified file (--stderr file) instead of
using a separate 'errors' stream.
- In tool_setup.h override stdio.h's
tool: improve --stderr handling
- freopen stderr with the user-specified file (--stderr file) instead of
using a separate 'errors' stream.
- In tool_setup.h override stdio.h's stderr macro as global variable
tool_stderr.
Both freopen and overriding the stderr macro are necessary because if
the user-specified filename is "-" then stdout is assigned to
tool_stderr and no freopen takes place. See the PR for more information.
Ref: https://github.com/curl/curl/issues/10491
Closes https://github.com/curl/curl/pull/10673
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