[c++0x] <date_time> implementation, take 4

[Pedro Lamarão]

Fixed function definitions to uglify local names.

Fixed testsuite to use --std=gnu++0x instead of --std=c++0x.

make check FAILs only abi_check.

2008-03-11  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.
    * include/Makefile.am: add date_time in std headers.
    * src/Makefile.am: add date_time.cc to source files.

--
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