update enc to allow building on OTP23+

Also as far back as OTP21. In 2021, the Ericsson OTP team only
officially support OTP22 & OTP23, and in 2022, OTP 24 will replace
OTP22.

See  https://github.com/davisp/erlang-native-compiler/pull/2
diff --git a/enc b/enc
index 3626e16..567ad9c 100755
--- a/enc
+++ b/enc
Binary files differ