Re-XFAIL size-and-align.rs to put out burning tinderbox

Author: pcwalton

src/Makefile

@@ -473,6 +473,7 @@ TEST_XFAILS_RUSTC := $(addprefix test/run-pass/, \
                         pred.rs \
                         preempt.rs \
                         rt-circular-buffer.rs \
+                        size-and-align.rs \
                         spawn-fn.rs \
                         spawn-module-qualified.rs \
                         spawn.rs \