Check against a bug of frexp() on IRIX 6.5.

[pspp] / ChangeLog

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+2007-03-25  Bruno Haible  <bruno@clisp.org>
+
+       * m4/frexp.m4 (gl_FUNC_FREXP_WORKS): Add check whether frexp(inf)
+       returns inf. Needed on IRIX 6.5.
+
 2007-03-25  Bruno Haible  <bruno@clisp.org>
 
        * tests/test-frexpl.c: Include isnanl-nolibm.h.