Teach configure about other 64-bit multilib systems (ia64,ppc64,s390x,x86_64).

--- nss_db-2.2/configure.in	2014-06-14 12:59:53.000000000 -0400
+++ nss_db-2.2/configure.in	2014-06-14 12:59:47.000000000 -0400
@@ -118,15 +118,18 @@
   # files.  I.e., when the installation prefix is "/usr" we have to place
   # shared library objects on the root partition in /lib.
   if test "$prefix" = "/usr" -o "$prefix" = "/usr"; then
-    # 64bit libraries on sparc go to /lib64 and not /lib
-    if test "$host_cpu" = "sparc64"; then
+    # 64bit libraries on multilib systems go to /lib64 and not /lib
+    case "$host_cpu" in
+    powerpc64|sparc64|s390x|x86_64)
       slibdir="/lib64"
       if test "$libdir" = '${exec_prefix}/lib'; then
         libdir='${exec_prefix}/lib64';
       fi
-    else
+      ;;
+    *)
       slibdir="/lib"
-    fi
+      ;;
+    esac
   fi
   ;;
 esac