Code style/whitespace cleanup; remove obsolete headers.

And move the MAP_ANON redefinition from py/asmx64.c to unix/alloc.c.
diff --git a/py/compile.c b/py/compile.c
index 267eb2c..d920187 100644
--- a/py/compile.c
+++ b/py/compile.c
@@ -3692,7 +3692,7 @@
 #elif MICROPY_EMIT_THUMB
         emit_native_thumb_free(emit_native);
 #elif MICROPY_EMIT_ARM
-	emit_native_arm_free(emit_native);
+        emit_native_arm_free(emit_native);
 #endif
     }
 #endif