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This is intended to be a pure version of m4_append_uniq, i.e. it does all its work by expansion and not by defining macros. It will be used by the code in the next commit. WIP: currently has severe bugs, foreach.m4 version still needed. * lib/m4sugar/m4sugar.m4 (m4_join_uniq, _m4_join_uniq): New macros. * doc/autoconf.texi: Document m4_join_uniq. * tests/m4sugar.at: Test m4_join_uniq.