For PR automake/317:
* Makefile.am (maintainer-check): Disallow `for f in $(FILES)',
suggest `list='$(FILES)'; for f in $$list' instead.
* lib/am/distdir.am (distdir): Adjust `for' usage.
* lib/am/texinfos.am (maintainer-clean-aminfo): Likewise.
* tests/dollar.test: New file.
* tests/Makefile.am (TESTS): Add dollar.test.
Reported by Eric Siegerman and Philip Fong.