Honour the logical current working directory ($PWD) when using config's -d destdir option.  For an automounted src tree using the logical cwd in the Makefile keeps amd(8)'s mount timeout refreshed.  Code to check $PWD's validity cribbed from pwd(1).
Honour the logical current working directory ($PWD) when using config's
-d destdir option.  For an automounted src tree using the logical cwd
in the Makefile keeps amd(8)'s mount timeout refreshed.  Code to check
$PWD's validity cribbed from pwd(1).

Discussed on hackers@.

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