Merge pull request swiftlang#28862 from xiaobai/fix-thinko

[build] Unify android-arm64 and android-aarch64 in build-script-impl

Author: compnerd

utils/build-script-impl

@@ -1215,7 +1215,7 @@ function common_cross_c_flags() {
         android-armv7)
             echo -n " -arch armv7"
             ;;
-        android-arm64)
+        android-aarch64)
             echo -n " -arch aarch64"
             ;;
     esac