scripts: hack-in lib32->lib symlinks

Some archs (eg. ppc64 with n32 ABI) will install their
variants in lib32/ instead of lib/, so do for lib32 as
we do for lib64->lib symlinks.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>

 # Compute IA-64-specific values

 CT_DoArchTupleValues() {

     # The architecture part of the tuple:

     CT_TARGET_ARCH="${CT_ARCH}"

 }