Add __ARM64__ when checking for flags

libraries/vecmath/src/vecmath.cpp

-#if defined(__ANDROID__)
+#if defined(__ARM__) || defined(__ARM64__)
     #include "neon_mathfun.h"
 #else
     #if !defined(__PNACL__)

openmmapi/include/openmm/internal/hardware.h

@@ -93,7 +93,8 @@ static int getNumProcessors() {
 #ifdef WIN32
 #define cpuid __cpuid
 #else
-#if !defined(__ANDROID__) && !defined(__PNACL__) && !defined(__PPC__)
+#if !defined(__ANDROID__) && !defined(__PNACL__) && !defined(__PPC__) \
+    && !defined(__ARM__) && !defined(__ARM64__)
     static void cpuid(int cpuInfo[4], int infoType){
     #ifdef __LP64__
         __asm__ __volatile__ (

openmmapi/include/openmm/internal/vectorize.h

@@ -32,7 +32,7 @@
  * USE OR OTHER DEALINGS IN THE SOFTWARE.                                     *
  * -------------------------------------------------------------------------- */
 
-#if defined(__ARM__)
+#if defined(__ARM__) || defined(__ARM64__)
     #include "vectorize_neon.h"
 #elif defined(__PPC__)
     #include "vectorize_ppc.h"