Fix identification of MinGW64 on WoA

Author: martin-frbg

cmake/system_check.cmake

@@ -28,7 +28,7 @@ if(MINGW)
     execute_process(COMMAND ${CMAKE_C_COMPILER} -dumpmachine
               OUTPUT_VARIABLE OPENBLAS_MINGW_TARGET_MACHINE
               OUTPUT_STRIP_TRAILING_WHITESPACE)
-    if(OPENBLAS_MINGW_TARGET_MACHINE MATCHES "amd64|x86_64|AMD64")
+    if(OPENBLAS_MINGW_TARGET_MACHINE MATCHES "amd64|x86_64|AMD64|aarch64")
       set(MINGW64 1)
     endif()
 endif()