FindJNI: Add arm64 support

On 64-bit ARM, JVM directories have an arm64 suffix.

Modules/FindJNI.cmake

@@ -59,6 +59,8 @@ macro(java_append_library_directories _var)
       endif()
     elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^i.86$")
         set(_java_libarch "i386")
+    elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^aarch64")
+        set(_java_libarch "arm64")
     elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^alpha")
         set(_java_libarch "alpha")
     elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^arm")