Detect 32bit environment on 64bit ARM hardware

for #2056, using same approach as #2058

cmake/system_check.cmake

@@ -49,7 +49,11 @@ elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "i686.*|i386.*|x86.*|amd64.*|AMD64.*")
 elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(arm.*|ARM.*)")
   set(ARM 1)
 elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(aarch64.*|AARCH64.*)")
-  set(ARM64 1)
+  if("${CMAKE_SIZEOF_VOID_P}" EQUAL "8")
+    set(ARM64 1)
+  else()
+    set(ARM 1)
+  endif()
 endif()
 
 if (X86_64)