[librsvg] Fix build against old libxml2

[Christian Persch <chpe src gnome org>]

commit a52d5bf6cbbffa89982b5f4820280c9d07aed2cb
Author: Christian Persch <chpe gnome org>
Date:   Sun Jun 27 19:29:05 2010 +0200

    Fix build against old libxml2
    
    Before libxml2 commit
    http://git.gnome.org/browse/libxml2/commit/?id=a8f09ce8d33dbadd398efe5af36ec7984de31e4c
    xmlPushInput returned void, not int. The first release with this commit
    is libxml2 2.7.0.

 rsvg-base.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/rsvg-base.c b/rsvg-base.c
index b73d150..6d7a5c3 100644
--- a/rsvg-base.c
+++ b/rsvg-base.c
@@ -1876,11 +1876,15 @@ rsvg_handle_read_stream_sync (RsvgHandle   *handle,
 
     buffer = _rsvg_xml_input_buffer_new_from_stream (stream, cancellable, XML_CHAR_ENCODING_NONE, &err);
     input = xmlNewIOInputStream (priv->ctxt, buffer, XML_CHAR_ENCODING_NONE);
+#if LIBXML_VERSION >= 20700
     if (xmlPushInput (priv->ctxt, input) < 0) {
         rsvg_set_error (error, priv->ctxt);
         xmlFreeInputStream (input);
         return FALSE;
     }
+#else
+    xmlPushInput (priv->ctxt, input);
+#endif
 
     result = xmlParseDocument (priv->ctxt);
     if (result != 0) {