dovecot - Mar 2019 - dovecot-openssl-common.c and [-Wincompatible-pointer-types]

Warnings from clang 7.0 when compiling dovecot-openssl-common.c from dovecot
2.3.5 with openssl 1.1.1a.

This is dovecot's configuration:
> config_options="--prefix=$prefix \
>     --sysconfdir=$prefix/etc \
>    --datarootdir=$prefix/share \
>    --mandir=$man \
>    --docdir=$doc \
>    --with-docs \
>     --with-ssl=openssl --with-ssldir=$prefix/etc \
>    --with-sodium \
>    --with-libiconv-prefix=/opt/libiconv \
>    \
>    --with-bzlib=no \
>    --with-gssapi=no \
>    --with-ldap=no \
>    --with-lucene=no \
>    --with-lz4=no \
>    --with-lzma=no \
>    --with-pam=no \
>    --with-solr=no \
>    --with-sql=no \
>    --with-vpopmail=no \
>    --with-zlib=no \
>    \
>    --enable-dependency-tracking";
Note on passing: --with-ssldir=$prefix/etc is ignored by the configurator, as it
forces $prefix/etc/dovecot.
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