vasnprintf: fix x86/glibc regression on printf("%La", 0.0L)

[pspp] / ChangeLog

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+2008-09-22  Eric Blake  <ebb9@byu.net>
+            Bruno Haible  <bruno@clisp.org>
+
+       vasnprintf: fix x86/glibc regression on printf("%La", 0.0L)
+       * lib/vasnprintf.c (VASNPRINTF): Support 0.0 on platforms that
+       supply %A but mishandle pseudo-NaN.
+       Reported by Simon Josefsson.
+
 2008-09-21  Bruno Haible  <bruno@clisp.org>
 
        * tests/test-lock.c (main): Tweak skip message.