fix image installs

Dockerfile

@@ -7,9 +7,7 @@ RUN sed -i 's@deb.debian.org@apt-cache.lan/deb.debian.org@g' /etc/apt/sources.li
     dpkg --add-architecture armhf && \
     apt-get update -y && \
 	apt-get install -y build-essential dpkg-dev dpkg-cross \
-	devscripts make ccache distcc \
-	build-essential:armhf dpkg-dev:armhf \
-	devscripts:armhf make:armhf ccache distcc && \
+	devscripts make ccache distcc && \
 	apt-get remove --purge -y exim* && \
 	apt-get autoremove --purge -y && \
 	apt-get clean -y && \