cmake: set -fno-aligned-allocation on macOS ARM

We set a deployment target that is lower than 10.14, which means
we have to disable aligned allocation otherwise compilation fails.

CMakeLists.txt

@@ -999,6 +999,9 @@ else()
 
   if(APPLE)
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fvisibility=default -DGTEST_HAS_TR1_TUPLE=0")
+    if(ARM)
+      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-aligned-allocation")
+    endif()
   endif()
 
   set(DEBUG_FLAGS "-g3")