lttng-ust: add support for aarch64_be

Upstream-Status: Pending

Signed-off-by: Tudor Florea <tudor.florea@enea.com>

diff --ruN a/configure.ac b/configure.ac
--- a/configure.ac	2016-02-18 14:54:54.651713647 +0100
+++ b/configure.ac	2016-02-18 14:56:11.057865297 +0100
@@ -240,6 +240,7 @@
 	s390x) NO_UNALIGNED_ACCESS=1 ;;
         arm*) NO_UNALIGNED_ACCESS=1 ;;
 	aarch64) NO_UNALIGNED_ACCESS=1 ;;
+        aarch64_be) NO_UNALIGNED_ACCESS=1 ;;
 	mips*) NO_UNALIGNED_ACCESS=1 ;;
 	tile*) NO_UNALIGNED_ACCESS=1 ;;
 	*)