m4_set_foreach: minor optimization As a minor optimization, most macros in m4sugar.m4 try to avoid output of 'dnl' in the expansion, to reduce the number of macros that must be expanded at each call site. * lib/m4sugar/m4sugar.m4 (m4_set_foreach): Don't expand dnl in all callers. Signed-off-by: Eric Blake <[email protected]>