gnulib: use more-standard license notice wording
* gnulib-tool (func_emit_copyright_notice): When emitting a license notice into a file, use the standard wording as suggested by the current information for GNU maintainers, except say "file" rather than "program". The new wording gives a license version number, which addresses an issue raised by Glenn Morris in <http://lists.gnu.org/archive/html/bug-gnulib/2011-09/msg00397.html>. * m4/onceonly.m4: Use that same wording here, too.
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