term-ostream: Accommodate a shell that is not in /bin/sh.
* gnulib-local/tests/test-term-ostream-xterm.sh: Renamed from
gnulib-local/tests/test-term-ostream-xterm.
* gnulib-local/modules/term-ostream-tests (Files, Makefile.am): Update
accordingly.
* gnulib-local/Makefile.am (EXTRA_DIST): Likewise.
