security fix for 'm4 -F'

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$ m4 -F /nosuch/%x </dev/null
m4: /nosuch/0: No such file or directory

If that doesn't scare you, consider a file name that contains %n.  This
security hole has been present since M4 1.3.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             [email protected]
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