[c++0x] <date_time> implementation, take 5

[Pedro Lamarão]

Fixed errors detected by abi_check.

Patch created with svn diff.

New test suite attached as tarball.

2008-03-14  Pedro Lamarão  <pedro.lamarao@gmail.com>

   * include/std/date_time: new file.
   * src/date_time.cc: new file.
   * config/abi/pre/gnu.ver: added <date_time> symbols in version
   GLIBCXX_3.4.11 and changed two patterns in version GLIBCXX_3.4
   that matched new symbols.
   * include/Makefile.am: add date_time in std headers.
   * src/Makefile.am: add date_time.cc to source files.

--
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