testsuite failures on MSYS: reading from stdin

[Ralf Wildenhues]

I'm seeing a couple of testsuite failures on MSYS: 'Input from stdin'
and 'AC_CONFIG_FILES, HEADERS, LINKS, and COMMANDS'.  Both fail due to
issues with redirection of stdin.

It's interesting to note that running
  echo hello | ./micro-suite

on the command line in the former test causes micro-suite to pass.
Looks like a MSYS problem to me, I just haven't been able to narrow
it down enough to report a bug with them.

Cheers,
Ralf