Description of problem:
rpmbuild stores i386 libraries in incorrect directory under x86_64.fc6 environment. 

#rpmbuild --target=i386 -ba xxxxxx.spec
the .RPM package built should include i386 library files in /usr/lib, but in
/usr/lib64. Of course, rpm installs the files into the wrong directory: /usr/lib64.

Version-Release number of selected component (if applicable):
rpm-build-4.4.2-32.x86_64

How reproducible:
Always

Steps to Reproduce:
1.Modify the spec file as follows;
"....
%build
echo %_target
echo %_lib
echo %_libdir
...."
2.run #rpmbuild --target=i386 -ba xxxxxx.spec

  
Actual results:
rpmbuild shows me;
"....
+ echo i386-linux
i386-linux
+ echo lib64
lib64
+ echo /usr/lib64
/usr/lib64
...."

Expected results:
"....
+ echo i386-linux
i386-linux
+ echo lib
lib
+ echo /usr/lib
/usr/lib
...."