core/linuxlist: do not use 'new' as a parameter name

'new' is a reserved keyword in C++, so including this header from
a C++ project (like osmo-pcu) breaks compilation.  Let's rename
it in the same way as it's already done in this file: add '_'.

Change-Id: I7f7d9143edca75ce932601386a8766b0a62c0e24
Fixes: I8ef73a62fe9846ce45058eb21cf999dd3eed5741
diff --git a/include/osmocom/core/linuxlist.h b/include/osmocom/core/linuxlist.h
index 2c3a0a4..5ccd462 100644
--- a/include/osmocom/core/linuxlist.h
+++ b/include/osmocom/core/linuxlist.h
@@ -579,11 +579,11 @@
  * reference of the first entry if it exists.
  */
 static inline void hlist_move_list(struct hlist_head *old,
-				   struct hlist_head *new)
+				   struct hlist_head *_new)
 {
-	new->first = old->first;
-	if (new->first)
-		new->first->pprev = &new->first;
+	_new->first = old->first;
+	if (_new->first)
+		_new->first->pprev = &_new->first;
 	old->first = NULL;
 }