add new osmo_sockaddr_from_str_and_uint() function

The function is basically a shortcut for getaddrinfo with storing the
output data into our 'struct osmo_sockaddr'.

Change-Id: I6b5c0bf8ca97e6358d992fb2ff45ffd53ba15197
Related: SYS#6657
diff --git a/src/core/libosmocore.map b/src/core/libosmocore.map
index ae8a068..3d6aa42 100644
--- a/src/core/libosmocore.map
+++ b/src/core/libosmocore.map
@@ -374,6 +374,7 @@
 osmo_signal_unregister_handler;
 osmo_sockaddr_cmp;
 osmo_sockaddr_from_octets;
+osmo_sockaddr_from_str_and_uint;
 osmo_sockaddr_in_to_str_and_uint;
 osmo_sockaddr_is_any;
 osmo_sockaddr_is_local;