x86_64 compilation for RHEL4 and RHEL3 .spec files needs fix

I've already submitted this to the users@subversion.tigris.org, where I wrote:

    The .spec files for RHEL4, and apparently for RHEL3, need to use "%
{_libdir}" instead of "/usr/lib" in order that they compile properly and build 
appropriate RPM contents for x86_64 based systems. The spec file is easily 
patched, as is the RHEL3 and RHEL4 patch, to support this.

   The problem is easily duplicated by attempting to compile the subversion-
1.3.0 SRPM under RHEL4 on an x86_64 operating system and hardware.

I'd be happy to submit patches for it: I've also noticed that the patch for 
RHEL3 and RHEL4 uses a hard-coded /usr/lib/httpd that also needs to be 
addressed to allow it to be /usr/lib64/https, but I haven't re-written that 
patch yet, merely tweaked the .SPEC file to edit the same file after the patch 
is applied.

I'm happy to submit patches for this: it should probably be reviewed and 
integrated by David Summers, who seems to be involved in the RedHat binary 
bundling.

Original issue reported by nkadel