[Dovecot] fallocate and glibc 2.10

[Paul Howarth]

In glibc 2.10 (32 bit) fallocate() exists but fallocate64() doesn't.
When _FILE_OFFSET_BITS==64, fallocate() is a redirect to fallocate64()
and the program can't be linked (fails to find symbol fallocate64).
See http://bugzilla.redhat.com/500487

Attached patch detects fallocate() more robustly to guard against this
problem.

Cheers, Paul.
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