Patch: Add #include <stddef.h> in fastjar

[Mohan Embar]

>BTW, if you just update your mingw-runtime package to the latest
>release, this problem would be cured. It's really a deficiency
>in older mingw-runtime releases where time.h did not indicate
>that it "needs NULL" (see latest mingw-runtime time.h for
>details on what this means).

Ranjit,

I thought I was using mingw-runtime-2.4. What is the latest release?

-- Mohan
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