Pigeonhole-0.5.7 fails to build from sources

[Lefteris Tsintjelis]

Solution is to uninstall the port and then build. If dovecot is already 
installed it will not build.

On 13/7/2019 0:08, Lefteris Tsintjelis via dovecot wrote:
> Latest update fails to build from sources in FreeBSD 12-STABLE
> 
> --- lda-sieve-plugin.lo ---
> lda-sieve-plugin.c:82:27: error: variable has incomplete type 'struct 
> smtp_submit_input'
>          struct smtp_submit_input submit_input;