Removes ca-certificates runtime deps as it doesn't help neither curl nor svn

possibly because of custom openssl version

This reverts commit 4de0caf.

Author: solsson

httpd/Dockerfile

@@ -8,12 +8,8 @@ ENV SVN_BZ2_SHA1 0999f5e16b146f824b952a5552826b9cb5c47b13
 
 ENV DEBIAN_FRONTEND noninteractive
 
-# we have the stretch package repo from upstream, so let's use https://packages.debian.org/stretch/ca-certificates
-ENV CA_CERTIFICATES_VERSION 20161130
-
 RUN depsRuntime=" \
 		libsqlite3-0 \
-		ca-certificates=$CA_CERTIFICATES_VERSION \
 		curl \
 		libserf-1-1 \
 	" \