let the user disable alignment altogether by #defining EIGEN_DONT_ALIGN.
Until now, the user had to edit the source code to do that.
Internally, add EIGEN_ALIGN that takes into account both EIGEN_DONT_ALIGN.and
EIGEN_ARCH_WANTS_ALIGNMENT. From now on, only EIGEN_ALIGN should be used to
test whether we want to align.
diff --git a/test/dynalloc.cpp b/test/dynalloc.cpp
index c0fcdde..df87ff5 100644
--- a/test/dynalloc.cpp
+++ b/test/dynalloc.cpp
@@ -24,7 +24,7 @@
#include "main.h"
-#if EIGEN_ARCH_WANTS_ALIGNMENT
+#if EIGEN_ALIGN
#define ALIGNMENT 16
#else
#define ALIGNMENT 1