Only install curl when building openssl

circle.yml

@@ -4,8 +4,6 @@ job: &JOB
   - image: jimmycuadra/rust:1.19.0
   steps:
   - checkout
-  - run: apt-get update
-  - run: apt-get install -y curl
   - run: ./test/add_target.sh
   - restore_cache:
       key: registry

test/build_openssl.sh

@@ -5,6 +5,9 @@ if [ -d ~/openssl ]; then
     exit 0
 fi
 
+apt-get update
+apt-get install -y --no-install-recommends curl
+
 case "${LIBRARY}" in
 "libressl")
     URL1="http://ftp3.usa.openbsd.org/pub/OpenBSD/LibreSSL/libressl-${VERSION}.tar.gz"