bindep: Remove dead markers

Ubuntu 12.04 is rather long in the tooth now. Remove the bindep markers
for it.

Change-Id: Ie5c2d7ab1e3e637a1d42712e22a7a6e6d6427020
Signed-off-by: Stephen Finucane <sfinucan@redhat.com>

bindep.txt

@@ -30,8 +30,8 @@ postgresql-devel [platform:rpm test]
 postgresql-server [platform:rpm]
 python-dev [platform:dpkg test]
 python-devel [platform:rpm test]
-python3-all [platform:dpkg !platform:ubuntu-precise]
-python3-all-dev [platform:dpkg !platform:ubuntu-precise]
+python3-all [platform:dpkg]
+python3-all-dev [platform:dpkg]
 python3-devel [platform:fedora]
 python34-devel [platform:centos]
 sqlite-devel [platform:rpm test]