curlx/strerr: use strerror_s() on Windows
#19646
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To replace deprecated, unsafe `_sys_*` global variables. Refs: https://learn.microsoft.com/cpp/c-runtime-library/errno-doserrno-sys-errlist-and-sys-nerr https://learn.microsoft.com/cpp/c-runtime-library/reference/strerror-s-strerror-s-wcserror-s-wcserror-s
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To replace deprecated, unsafe
sys_nerr,sys_errlistglobalvariables with the function suggested by the CRT warning silenced via
_CRT_SECURE_NO_WARNINGS:(where
strerrorin turn suggestsstrerror_s...)Upside: returns an error and has a Unicode variant. Downaside: happy
to return success when passing unrecognized error codes. Work it around
by looking for the string "Unknown error" returned in such cases and
falling back to other methods to retrieve a description.
Refs:
https://learn.microsoft.com/cpp/c-runtime-library/errno-doserrno-sys-errlist-and-sys-nerr
https://learn.microsoft.com/cpp/c-runtime-library/reference/strerror-s-strerror-s-wcserror-s-wcserror-s
https://github.com/curl/curl/pull/19646/files?w=1