Fixed functions.in to set arch_suffix to $SDECFG_ABI_DEFAULT if we do not build multilib (hack!)

Note: As discussed with Alejandro we agreed on removing that hack later
      while removing ugly libdir mangling from packages (i.e. xorg)!

lib/functions.in

@@ -815,6 +815,9 @@ pkggetdir() {
 		libdir)
 		    case $arch_machine in
 			powerpc64|sparc64|x86_64|mips64)
+				if [ -z "$arch_suffix" ]; then
+					arch_suffix="$SDECFG_ABI_DEFAULT"
+				fi
 				echo "$xprefix/lib$arch_suffix"	;;
 			*)
 				echo "$xprefix/lib"	;;