Description of problem:
Source rpm's that build kernel modules leave messy BUILD/smp and BUILD/hugemem
directories when they are done.  These don't get cleaned up, and when you are
building the next rpm that does kernel modules, there is conflicting files, so
the next rpm doesn't build correctly. 

Version-Release number of selected component (if applicable):
cman-kernel-2.6.9-36.0.src.rpm
dlm-kernel-2.6.9-34.0.src.rpm
gnbd-kernel-2.6.9-8.27.src.rpm
GFS-kernel-2.6.9-35.5.src.rpm

How reproducible:
Every time you don't have something that completely cleans your rpm build
enviroment.

Steps to Reproduce:
1. Build one of the rpm's in the above list (I believe
gnbd-kernel-2.6.9-8.27.src.rpm is the first one that will build in a fresh
enviroment)
2. Try to build one of the other rpm's in the above list, without completely
clearing your rpm build enviroment.
3.
  
Actual results:
The build of the second rpm will fail on the smp section.

Expected results:
The rpm should build correctly if all dependancies are met.

Additional info:
Currently in all of the spec files, there is the lines
---------------
%build

BUILD_DIR=`pwd`
cp -r `pwd` ../smp
cp -r `pwd` ../hugemem
----------------

This is fine and the build works.  But the problem lies in that these
directories never get cleaned up, and so the next rpm that get's built just
slaps it's code into the same directories.

There needs to be something in the %clean section that will clean these
directories up.  Something like
------------------
%clean
rm -rf $RPM_BUILD_ROOT
BUILD_DIR=`pwd`
rm -rf `pwd` ../smp
rm -rf `pwd` ../hugemem
-------------------