%dir %attr erroneously inherit default directory permissions from %defattr.

Version-Release number of selected component (if applicable):
rpm-build-4.8.0-19.el6.i686

How reproducible:
# test.spec
Name: test
Version: 1.0
Release: 1
Summary: test
Group: Test
License: Test
BuildRoot: /var/tmp/%{name}-%{version}-%{release}
%description
Test
%install
mkdir -p $RPM_BUILD_ROOT%{_localstatedir}/run
%files
%defattr(644, root, root, 755)
%dir %attr(775, root, test) %{_localstatedir}/run

Steps to Reproduce:
1. rpmbuild -bb test.spec
  
Actual results:
$ rpm -qlvp test-1.0-1.i386.rpm
drwxr-xr-x    2 root    test                0 Mar 20 10:37 /var/run

Expected results (produced on RHEL 5.7 system):
$ rpm -qvlp test-1.0-1.i386.rpm
drwxrwxr-x    2 root    test                0 Mar 20 10:07 /var/run

Additional info:
Also reported in following bug trackers:
https://bugs.launchpad.net/rpm/+bug/633729
https://bugzilla.novell.com/show_bug.cgi?id=629048