MT#60476 Deprecate the sdp_manipulations remove/subst

Because currently it is directly handled by the
`generic_append_attr_to_gstring()` implementation, a couple
of functions (previously used by the sdp_replace)
are from now on obsolete and not needed anymore:
- `sdp_manipulations_subst_attr()`
- `sdp_manipulate_remove_attr()`

Just remove them.

Change-Id: Ia33218fa4c144812ff3265abafb62fd7f50f6955

daemon/sdp.c

@@ -343,22 +343,6 @@ static bool sdp_manipulate_remove_c(const char *attr_name, const sdp_ng_flags *f
 	return sdp_manipulate_remove(sdp_manipulations, &STR(attr_name));
 }
 
-/**
- * Checks whether an attribute removal request exists for a given session level.
- * `attr_name` must be without `a=`.
- */
-static bool sdp_manipulate_remove_attr(struct sdp_manipulations *sdp_manipulations,
-		const struct sdp_attribute *attr)
-{
-	if (sdp_manipulate_remove(sdp_manipulations, &attr->strs.key))
-		return true;
-	if (sdp_manipulate_remove(sdp_manipulations, &attr->strs.name))
-		return true;
-	if (sdp_manipulate_remove(sdp_manipulations, &attr->strs.line_value))
-		return true;
-	return false;
-}
-
 /**
  * Adds values into a requested session level (global, audio, video)
  */
@@ -399,24 +383,6 @@ static str *sdp_manipulations_subst(struct sdp_manipulations * sdp_manipulations
 	return cmd_subst_value;
 }
 
-/**
- * Substitute values for a requested session level (global, audio, video).
- * `attr_name` must be without `a=`.
- */
-static str *sdp_manipulations_subst_attr(struct sdp_manipulations * sdp_manipulations,
-		const struct sdp_attribute * attr)
-{
-	str * cmd_subst_value;
-
-	if ((cmd_subst_value = sdp_manipulations_subst(sdp_manipulations, &attr->strs.key)))
-		return cmd_subst_value;
-	if ((cmd_subst_value = sdp_manipulations_subst(sdp_manipulations, &attr->strs.name)))
-		return cmd_subst_value;
-	if ((cmd_subst_value = sdp_manipulations_subst(sdp_manipulations, &attr->strs.line_value)))
-		return cmd_subst_value;
-	return NULL;
-}
-
 static void append_str_attr_to_gstring(GString *s, const str * name, const str * value,
 		const sdp_ng_flags *flags, enum media_type media_type);
 static void append_attr_int_to_gstring(GString *s, const char * value, const int additional,