include: Switch to #pragma once pattern

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
diff --git a/include/osmocom/vty/vector.h b/include/osmocom/vty/vector.h
index 22a184d..7caa5ff 100644
--- a/include/osmocom/vty/vector.h
+++ b/include/osmocom/vty/vector.h
@@ -20,8 +20,7 @@
  * 02111-1307, USA.
  */
 
-#ifndef _ZEBRA_VECTOR_H
-#define _ZEBRA_VECTOR_H
+#pragma once
 
 /* struct for vector */
 struct _vector {
@@ -60,5 +59,3 @@
 void *vector_lookup_ensure(vector, unsigned int);
 
 extern void *tall_vty_vec_ctx;
-
-#endif				/* _ZEBRA_VECTOR_H */