Build manylinux quietly.

scripts/releases/make-manylinux

@@ -18,9 +18,9 @@ if [ -d /gevent -a -d /opt/python ]; then
         cd /tmp/build
         git clone /gevent gevent
         cd gevent
-        $variant/bin/pip install -U -r ci-requirements.txt
+        $variant/bin/pip install -q -U -r ci-requirements.txt
         # manylinux 1 is too old to build libuv, don't even try.
-        GEVENT_NO_LIBUV_BUILD=1 PATH=$variant/bin:$PATH $variant/bin/python setup.py bdist_wheel
+        GEVENT_NO_LIBUV_BUILD=1 PATH=$variant/bin:$PATH $variant/bin/python setup.py bdist_wheel -q
         auditwheel repair dist/*.whl
         cp wheelhouse/*.whl /gevent/wheelhouse
         cd /gevent