Check arch/default/ path when detecting kernel objects on SLES

We still preferentially use arch/arch looking for a native version
but if that fails it is acceptable to use default.

config/kernel.m4

@@ -79,8 +79,10 @@ AC_DEFUN([ZFS_AC_KERNEL], [
 	AC_MSG_RESULT([$kernelsrc])
 	AC_MSG_CHECKING([kernel build directory])
 	if test -z "$kernelbuild"; then
-		if test -d ${kernelsrc}-obj; then
+		if test -d ${kernelsrc}-obj/`arch`/`arch`; then
 			kernelbuild=${kernelsrc}-obj/`arch`/`arch`
+		elif test -d ${kernelsrc}-obj/`arch`/default; then
+		        kernelbuild=${kernelsrc}-obj/`arch`/default
 		elif test -d `dirname ${kernelsrc}`/build-`arch`; then
 			kernelbuild=`dirname ${kernelsrc}`/build-`arch`
 		else