Fix compilation issues with OTP 18.3

c_src/driver_comm.c

@@ -55,7 +55,7 @@ char *read_string(char **data) {
 void *ejs_alloc(ErlDrvSizeT size) {
     void *p = driver_alloc(size);
     if (p == NULL) {
-        erl_exit(1, "erlang_js: Can't allocate %lu bytes of memory\n", size);
+        erts_exit(1, "erlang_js: Can't allocate %lu bytes of memory\n", size);
     }
     return p;
 }

c_src/driver_comm.h

@@ -30,7 +30,7 @@ char *read_string(char **data);
 
 /* Wrapper around driver_alloc() that checks  */
 /* for OOM.                                   */
-void erl_exit(int n, char*, ...);
+void erts_exit(int n, char*, ...);
 void *ejs_alloc(ErlDrvSizeT size);
 
 #endif

src/js_benchmark.erl

@@ -38,9 +38,8 @@ run() ->
 %% @private
 time_calls(Ctx, Count) ->
     io:format("Starting: ~p~n", [Count]),
-    Start = erlang:now(),
-    do_calls(Ctx, Count),
-    timer:now_diff(erlang:now(), Start) / Count.
+    {Elapsed, _} = timer:tc(fun do_calls/2, [Ctx, Count]),
+    Elapsed / Count.
 
 %% @private
 do_calls(_Ctx, 0) ->