Building 32-bit ARC to work with ATLAS SW

Starting with rather clean 64-bit RHEL5:

# yum install zlib-devel # not specifying bitness will install 32-bit libraries in addition to 64-bit
# yum install libsigc++20-devel
# yum install  globus-callout-devel globus-gsi-callback-devel globus-gsi-cert-utils-devel globus-gsi-openssl-error-devel globus-gsi-proxy-core-devel globus-gsi-proxy-ssl-devel globus-gssapi-error-devel globus-gssapi-gsi-devel globus-libtool-devel globus-xio-devel globus-xio-gsi-driver-devel globus-xio-popen-driver-devel globus-openssl-module-devel
# yum install libtool-ltdl-devel