[Dovecot] Patch for pigeonhole 0.4.0 avoiding PATH_MAX

[Svante Signell]

Hi,

I recently downloaded and built dovecot-2.2.2 and
dovecot-2.2-pigeonhole-0.4.0 on GNU/Linux and GNU/Hurd. The changes
needed will be sent to the Debian maintainer shortly. Latest Debian
release is 2.1.7-7 and dovecot-2.1-pigeonhole-0.3.1. When building
dovecot-2.2.2 there were no PATH_MAX problems on GNU/Hurd, thank you for
that. However, pigeonhole 0.4.0 had one remaining PATH_MAX construct.
The attached patch solves this problem. It it good enough to be accepted
upstream? (According to the description of t_malloc, free is not needed,
right?)

Thanks,
Svante Signell

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