[bug #62506] do-not-seek-the-unseekable.sh: result depends on "make -j<n>"

[Bjarni Ingi Gislason]

Follow-up Comment #8, bug #62506 (project groff):

  The failing part of the "preconv" test is the line

test -c /dev/stdin || exit 77 # skip

(In my case with "make -j2", "test -c /dev/stdin" says "not a character
device".)

  Changing this test from "-c" to "-e" results in the script ending
with PASS, because the error output of "preconv" contains the text
"stream is not seekable". 

  "/dev/stdin" needs only to exist to continue the script otherwise if
the test were absent:

printf '\n' | ./preconv -d /dev/empty

  shows

./preconv: error: can't open '/dev/empty': No such file or directory

results in "grep" not finding the "magic string" and "FAIL" would result
before "preconv" could actually do anything.

N.B.

  And testing with "make -j2" and even different arguments to '-j'
reveals something.

  The actual test is weather "stream is not seekable" is in the error
output of "preconv".  PASS is the result if it is.

  The error message from "preconv" lacks information about __FILE__ and
__LINE__.



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