Update curl for centos

Makefile

@@ -214,6 +214,7 @@ binaries/proxysql-${CURVER}-1-centos67.x86_64.rpm:
 	docker rm centos67_build || true
 	docker create --name centos67_build renecannao/proxysql:build-centos6.7 bash -c "while : ; do sleep 10 ; done"
 	docker start centos67_build
+	docker exec centos67_build bash -c "yum update -y nss curl libcurl"
 	docker exec centos67_build bash -c "cd /opt; git clone -b v${CURVER} https://github.com/sysown/proxysql.git proxysql"
 	docker exec centos67_build bash -c "cd /opt/proxysql; ${MAKE} clean && ${MAKE} ${MAKEOPT} build_deps && ${MAKE} ${MAKEOPT}"
 	docker exec -it centos67_build bash -c "cd /opt/proxysql ; mkdir -p proxysql/usr/bin; mkdir -p proxysql/etc; cp src/proxysql proxysql/usr/bin/; cp -a etc proxysql ; mkdir -p proxysql/usr/share/proxysql/tools ; cp -a tools/proxysql_galera_checker.sh tools/proxysql_galera_writer.pl proxysql/usr/share/proxysql/tools ; mv proxysql proxysql-${CURVER} ; tar czvf proxysql-${CURVER}.tar.gz proxysql-${CURVER}"
@@ -263,6 +264,7 @@ binaries/proxysql-${CURVER}-1-centos7.x86_64.rpm:
 	docker rm centos7_build || true
 	docker create --name centos7_build renecannao/proxysql:build-centos7 bash -c "while : ; do sleep 10 ; done"
 	docker start centos7_build
+	docker exec centos7_build bash -c "yum update -y nss curl libcurl"
 	docker exec centos7_build bash -c "cd /opt; git clone -b v${CURVER} https://github.com/sysown/proxysql.git proxysql"
 	sleep 2
 	docker exec centos7_build bash -c "cd /opt/proxysql; ${MAKE} clean && ${MAKE} ${MAKEOPT} build_deps && ${MAKE} ${MAKEOPT}"