[fixup] Fix tests in isolated environment

Fixup "[test] Add tests for build dependencies"

src/zc/buildout/tests/test_all.py

@@ -3676,6 +3676,7 @@ def test_pin_setup_requires_without_setup_eggs():
     ... find-links = %(link_server)s
     ... index = %(link_server)s+'index/'
     ... allow-picked-versions = false
+    ... newest = false
     ... parts = withsetuprequires
     ... [withsetuprequires]
     ... recipe = zc.recipe.egg
@@ -3703,6 +3704,7 @@ def test_pin_setup_requires_with_setup_eggs():
     ... find-links = %(link_server)s
     ... index = %(link_server)s+'index/'
     ... allow-picked-versions = false
+    ... newest = false
     ... parts = withsetuprequires
     ... [withsetuprequires]
     ... recipe = zc.recipe.egg:custom
@@ -3728,6 +3730,7 @@ def test_pin_build_system_requires_without_setup_eggs():
     ... find-links = %(link_server)s
     ... index = %(link_server)s+'index/'
     ... allow-picked-versions = false
+    ... newest = false
     ... parts = withbuildsystemrequires
     ... [withbuildsystemrequires]
     ... recipe = zc.recipe.egg
@@ -3755,6 +3758,7 @@ def test_pin_build_system_requires_with_setup_eggs():
     ... find-links = %(link_server)s
     ... index = %(link_server)s+'index/'
     ... allow-picked-versions = false
+    ... newest = false
     ... parts = withbuildsystemrequires
     ... [withbuildsystemrequires]
     ... recipe = zc.recipe.egg:custom