configure.in (_XOPEN_SOURCE, [...]): Check that _XOPEN_SOURCE 500L may be defined before defining these.

2002-10-18  Krister Walfridsson  <cato@df.lth.se>

       * libU77/configure.in (_XOPEN_SOURCE, _XOPEN_SOURCE_EXTENDED,
       __EXTENSIONS__, _FILE_OFFSET_BITS): Check that _XOPEN_SOURCE 500L
       may be defined before defining these.
       * libU77/configure: Regenerate.
       * libI77/configure.in (_XOPEN_SOURCE, _XOPEN_SOURCE_EXTENDED,
       __EXTENSIONS__, _FILE_OFFSET_BITS): Check that _XOPEN_SOURCE 500L
       may be defined before defining these.
       * libI77/configure: Regenerate.

From-SVN: r59639