bug in gc-arcfour-tests

[Eric Blake]

"./gnulib-tool --with-tests --test gc-arcfour" dies a miserable death,
with what looks like a nested here-doc using the same delimiter
as its container:

...
configure: creating ./config.status
./configure: line 6395: _ACEOF: command not found
grep: conf16235715subs.sed: No such file or directory
./configure: line 6397: test: =: unary operator expected
./configure: line 6406: syntax error near unexpected token `done'
./configure: line 6406: `done'
configure: error: /bin/sh './configure' failed for tests
make: Nothing to be done for `built_sources'.
Making distclean in tests
make[1]: Entering directory `/home/eblake/gnulib/testdir601299/tests'
make[1]: *** No rule to make target `distclean'.  Stop.
make[1]: Leaving directory `/home/eblake/gnulib/testdir601299/tests'
make: *** [distclean-recursive] Error 1

--
Eric Blake