Handle Apple labeling armv8 as arm64 rather than aarch64

Author: martin-frbg

cmake/system_check.cmake

@@ -54,14 +54,14 @@ elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "amd64.*|x86_64.*|AMD64.*")
   endif()
 elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "i686.*|i386.*|x86.*|amd64.*|AMD64.*")
   set(X86 1)
-elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(arm.*|ARM.*)")
-  set(ARM 1)
-elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(aarch64.*|AARCH64.*)")
+elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(aarch64.*|AARCH64.*|arm64.*|ARM64.*)")
   if("${CMAKE_SIZEOF_VOID_P}" EQUAL "8")
     set(ARM64 1)
   else()
     set(ARM 1)
   endif()
+elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(arm.*|ARM.*)")
+  set(ARM 1)
 elseif (${CMAKE_CROSSCOMPILING})
    if (${TARGET} STREQUAL "CORE2")
     if (NOT BINARY)