timegm: Assume declaration if function exists.

[pspp] / ChangeLog

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+2010-04-03  Bruno Haible  <bruno@clisp.org>
+
+       timegm: Assume declaration if function exists.
+       * m4/timegm.m4 (gl_FUNC_TIMEGM): Assume timegm is declared if and only
+       if it exists. Don't clobber ac_cv_func_timegm.
+
 2010-04-03  Bruno Haible  <bruno@clisp.org>
 
        time_r: Fix C++ test error on mingw.