[O] fails to start on 32 bit

[Sam Halliday]

Dear org-mode authors,

I discovered an error on startup on a 32 bit Windows build.

The line in org-footnote.el

               (format "fn:%x" (random #x100000000))

is too large and this fails with an overflow.

Please consider using a number that is 32bit compatible, I'm sure there
are plenty of integers in the 32bit range for footnote IDs :-)

-- 
Best regards,
Sam

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