Factor and simplify Makefile's and mpconfig.
diff --git a/unix/mpconfigport.h b/unix/mpconfigport.h
index 7a4622b..b790106 100644
--- a/unix/mpconfigport.h
+++ b/unix/mpconfigport.h
@@ -5,11 +5,12 @@
#define MICROPY_USE_READLINE (1)
#endif
-#define MICROPY_ENABLE_FLOAT (1)
-#define MICROPY_EMIT_CPYTHON (0)
#define MICROPY_EMIT_X64 (1)
#define MICROPY_EMIT_THUMB (0)
#define MICROPY_EMIT_INLINE_THUMB (0)
+#define MICROPY_MEM_STATS (1)
+#define MICROPY_ENABLE_REPL_HELPERS (1)
+#define MICROPY_ENABLE_FLOAT (1)
// type definitions for the specific machine