a better way to define arm architecture

Co-authored-by: Jared Van Bortel <[email protected]>

CMakeLists.txt

@@ -850,8 +850,9 @@ endif()
 
 set(ARCH_FLAGS "")
 
-if ((APPLE AND CMAKE_OSX_ARCHITECTURES AND ("${CMAKE_OSX_ARCHITECTURES}" MATCHES "arm64")) OR
-    (((APPLE AND NOT CMAKE_OSX_ARCHITECTURES) OR NOT APPLE) AND (("${CMAKE_SYSTEM_PROCESSOR}" MATCHES "arm") OR ("${CMAKE_SYSTEM_PROCESSOR}" MATCHES "aarch64") OR ("${CMAKE_GENERATOR_PLATFORM_LWR}" MATCHES "arm64"))))
+if (CMAKE_OSX_ARCHITECTURES MATCHES "arm64" OR CMAKE_GENERATOR_PLATFORM_LWR MATCHES "arm64" OR
+    (NOT CMAKE_OSX_ARCHITECTURES AND NOT CMAKE_GENERATOR_PLATFORM_LWR AND
+     (CMAKE_SYSTEM_PROCESSOR MATCHES "arm" OR CMAKE_SYSTEM_PROCESSOR MATCHES "aarch64")))
     message(STATUS "ARM detected")
     if (MSVC)
         add_compile_definitions(__ARM_NEON)