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Previously, attempting to read from a pipe would result in an error:
'not a regular file', disallowing use of files like /dev/stdin or
/dev/fd/3, named fifos, sockets, etc.
The tools already understand how to (try to) read from non-regular
files, so this change attempts to do so when the input is not seek-able
(the "regular file" capability that's in use here).
Additionally, this adds a test for the new behavior using a bash
herestring and process substitution (the latter of which shows up in
argv as something like `/dev/fd/NN`). Since bash isn't commonly
installed on Windows, this change also introduces a new capability to
filter tests to specific platforms (sorry).
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