prepare-source.mak makefile.

proto.h, and the manpages into this separate makefile, allowing it to
be used without first running configure (which builds the Makefile).

change (even if -p or -E aren't set).

characters that are legal in the current locale.

- Got rid of the --enable-iconv option for now.

  directory's inherited sgid bit is preserved.
- When not preserving permissions, ensure that newly-created
  files/dirs don't inherit any special permissions.

inconsistencies (it would have been the right thing to do if it
were done that way from the start, but not now).

user's filter rules already match it.

(which can occur if the user's system doesn't have strftime()).

%G (gid), and %B (perm bits).

- Added %M (modtime), %U (uid), %G (gid), and %B (perm bits) to
  log_formatted().

(or was manually disabled).