Theme Editor: Made Viewport the top level parse tree element, along with a bugfix to the tag parsing function

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26442 a1c6a512-1295-4272-9138-f99709370657
diff --git a/utils/themeeditor/skin_scan.h b/utils/themeeditor/skin_scan.h
index 682e32b..6aea92c 100644
--- a/utils/themeeditor/skin_scan.h
+++ b/utils/themeeditor/skin_scan.h
@@ -33,6 +33,7 @@
 void skip_whitespace(char** document);
 char* scan_string(char** document);
 int scan_int(char** document);
+int check_viewport(char* document); /* Checks for a viewport declaration */
 
 #ifdef __cplusplus
 }