getopt: handle POSIXLY_CORRECT set but not exported

[pspp] / ChangeLog

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+2010-09-07  Eric Blake  <eblake@redhat.com>
+
+       getopt: handle POSIXLY_CORRECT set but not exported
+       * m4/getopt.m4 (gl_GETOPT_CHECK_HEADERS): Restore pre-existing
+       export state of POSIXLY_CORRECT, due to bash set -o posix.
+       Reported by Dustin J. Mitchell.
+
 2010-09-05  Bruno Haible  <bruno@clisp.org>
 
        gnulib-tool: Highlight the changed options.