Rename msgb_wrap_with_TL()

This resolves an issue introduced in 84fb5bb6a09a6a358f98c654c84c3b99a0f24eef
when msgb_wrap_with_TL() was introduced as an inline function with
*exactly the same name* as in osmo-msc.git and openbsc.git.  We *NEVER*
do something like this.  Functions moved from applications to library
*MUST* always be renamed.  This has been the case for almost a decade
now.

With this subsequent change we make sure the libosmocore function
has a different name and doesn't clash.  After this commit, old
openbsc.git and osmo-bsc.git should again build fine.

Change-Id: If1e851ac605c8d2fde3da565b0bd674ea6350c2e
diff --git a/include/osmocom/core/msgb.h b/include/osmocom/core/msgb.h
index b7c8422..f006b34 100644
--- a/include/osmocom/core/msgb.h
+++ b/include/osmocom/core/msgb.h
@@ -368,7 +368,7 @@
 	osmo_store32be(word, space);
 }
 
-static inline unsigned char *msgb_wrap_with_TL(struct msgb *msgb, uint8_t tag)
+static inline unsigned char *msgb_push_tl(struct msgb *msgb, uint8_t tag)
 {
 	uint8_t *data = msgb_push(msgb, 2);