Timothy Flynn d09266237d LibCore: Define and use a fallible, OS-independent getgrent(_r) wrapper ...

Rather than maintaining a list of #ifdef guards to check systems that do
not provide the reentrant version of getgrent, we can use C++ concepts
to let the compiler perform this check for us.

While we're at it, we can also provide this wrapper as fallible to let
the caller TRY calling it.

2022-12-14 07:25:36 -05:00

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