Update to 1.4.10. Add commented out LICENSE=GPLv3 line.

Version 1.4.10 - 09 Jul 2007, by Eric Blake  (CVS version 1.4.9c)

* Upgrade from GPL version 2 to GPL version 3 or later.
* A number of portability improvements inherited from gnulib.
* Avoid undefined behavior introduced in 1.4.9b in the `format' builtin
  when handling %c.  However, this area of code has never been documented,
  and currently does not match the POSIX behavior of printf(1), so it may
  have further changes in the next version.

Version 1.4.9b - 29 May 2007, by Eric Blake  (CVS version 1.4.9a)

* Fix regression introduced in 1.4.9 in the `eval' builtin when performing
  division.
* Fix regression introduced in 1.4.8 in the `-F' option that made it
  impossible to freeze more than 512 kibibytes of diverted text.
* The synclines option `-s' no longer generates sync lines in the middle of
  multiline comments or quoted strings.
* Work around a number of corner-case POSIX compliance bugs in various
  broken stdio libraries.  In particular, the `syscmd' builtin behaves
  more predictably when stdin is seekable.
* The `format' builtin now understands formats such as %a, %A, and %'hhd,
  and works around a number of platform printf bugs.  Furthermore, the
  sequence format(%*.*d,-1,-1,1) no longer outputs random data.  However,
  some non-compliant platforms such as mingw still have known bugs in
  strtod that may cause testsuite failures.
* The testsuite is improved to also run gnulib portability tests for the
  features that M4 imports from gnulib.

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