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* lib/m4sugar/m4sugar.m4 (changeword, symbols): Don't rename if not already available as builtins. * bin/autoupdate.in (_au___undefine): New macro,... (_au__undefine): ...wrapped by ifdef to silence m4 warnings. Reported by Ralf Wildenhues. Signed-off-by: Eric Blake <ebb9@byu.net> (cherry picked from commit 5fb9f9c1a2a310caf37d45d2bc7640723e40c311) (cherry picked from commit 4b8a55e1e015fc5ba0ceee63ce3739ea1e41b686)