On MinGW, 'system' uses a non-posix shell that does not handle
apostrophe as a quoting character. For this test, quoting a command-line
with double quotes allows it to be run with both /bin/sh and cmd.exe.
* test-suite/tests/c-api.test (egrep): use double quotes when
quoting command line
The standalone egrep script has been deprecated by GNU grep.
'grep -E' is the suggested replacement.
* test-suite/tests/c-api.test (egrep): replace egrep with grep -E
Reported by Eli Zaretskii <eliz@gnu.org>.
* test-suite/test-suite/lib.scm (%null-device): New variable.
* test-suite/tests/c-api.test (egrep): Use %NULL-DEVICE instead of
/dev/null.
* test-suite/tests/popen.test ("open-input-pipe")["no duplicate"]:
Likewise.
The failure path for the c-api.test had been to call the undefined function
'fail', instead of logging the error like the other tests.
* test-suite/tests/c-api.test: modified
the seek-offset-test. Was just using files that end in "c", but
that caught the new ".doc" files, too, so make sure that files end
in ".c" before requiring that they include unistd.h if they
reference SEEK_(SET|CUR|END).
