[Bug 3497] New: setresuid configure check may need _GNU_SOURCE

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3497

            Bug ID: 3497
           Summary: setresuid configure check may need _GNU_SOURCE
           Product: Portable OpenSSH
           Version: 9.1p1
          Hardware: 68k
                OS: Mac OS X
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: Build system
          Assignee: unassigned-bugs at mindrot.org
          Reporter: sam at gentoo.org

OpenSSH's configure check for setresuid omits _GNU_SOURCE which, on
Linux systems with glibc+gcc at least, is needed to expose setresuid.

```
error: call to undeclared function 'setresuid'; ISO C99 and later do
not support implicit function declarations
[-Wimplicit-function-declaration]
```

Reproduced on master of openssh-portable at
6b17e128879ec6cc32ca2c28b5d894b4aa72e32d but originally hit with
9.1_p1.

It's technically harmless, I think, as OpenSSH provides its own
implementation if the system's copy is nonexistent or unsuitable, but
it's at least noise when trying to find broader Clang 16 issues (see
https://lwn.net/Articles/913505/ etc).

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