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Make AC_FOREACH be robust to active symbols. * acgeneral.m4 (m4_split, m4_join, m4_strip): New macros. (AC_FOREACH_COMMA): Renamed as... (m4_foreach): this. (_AC_CAR): Renamed as... (_m4_car): this. (_AC_FOREACH): Renamed as... (_m4_foreach): this. (_AC_COMMATIZE): Removed. (AC_FOREACH): Rewritten using m4_split, m4_join, m4_strip, and m4_foreach. * acgeneral.m4: Spell checked. * autoconf.texi: Likewise.