strtod: Add safety check.

[pspp] / ChangeLog

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+2010-07-13  Bruno Haible  <bruno@clisp.org>
+
+       strtod: Add safety check.
+       * lib/strtod.c (ldexp): Abort if this dummy replacement gets called.
+
 2010-07-12  Bruno Haible  <bruno@clisp.org>
 
        Unify tests that set gl_cv_func_ldexpl_no_libm.