[vala/staging] libxml-2.0: Bind xmlLastElementChild and xmlPreviousElementSibling

[Rico Tzschichholz <ricotz src gnome org>]

commit b3c279e6cb7a0272925d22f3a4dc44b58f50de19
Author: Daniel Espinosa <esodan gmail com>
Date:   Sat Sep 2 22:17:43 2017 -0500

    libxml-2.0: Bind xmlLastElementChild and xmlPreviousElementSibling
    
    https://bugzilla.gnome.org/show_bug.cgi?id=787201

 vapi/libxml-2.0.vapi |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/vapi/libxml-2.0.vapi b/vapi/libxml-2.0.vapi
index 9e1e8ff..273b0a5 100644
--- a/vapi/libxml-2.0.vapi
+++ b/vapi/libxml-2.0.vapi
@@ -878,9 +878,15 @@ namespace Xml {
                [CCode (cname = "xmlNextElementSibling")]
                public Node* next_element_sibling ();
 
+               [CCode (cname = "xmlPreviousElementSibling")]
+               public Node* previous_element_sibling ();
+
                [CCode (cname = "xmlFirstElementChild")]
                public Node* first_element_child ();
 
+               [CCode (cname = "xmlLastElementChild")]
+               public Node* last_element_child ();
+
                [CCode (cname = "xmlChildElementCount")]
                public ulong child_element_count ();
        }