Add simple patch to build fetchmail against newer libssl

services/fetchmail/Dockerfile

@@ -6,6 +6,7 @@ RUN apk add --no-cache curl tar xz autoconf git gettext build-base openssl opens
 
 RUN curl -L 'https://sourceforge.net/projects/fetchmail/files/branch_7-alpha/fetchmail-7.0.0-alpha6.tar.xz/download' | tar xJ
 RUN cd fetchmail-7.0.0-alpha6 && \
+    sed -i -e 's/SSLv3_client_method/SSLv23_client_method/' socket.c && \
     ./configure --with-ssl --prefix /usr/local --disable-nls && \
     make