*: make sure zebra.h is always included first

zebra.h pulls in config.h, which results in fiddling with things like
__FILE_OFFSET_BITS. It must always be included first, in order to set
flags that influence the compiler via <features.h>.

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
diff --git a/pimd/pim_static.c b/pimd/pim_static.c
index f2b8e85..3ab5011 100644
--- a/pimd/pim_static.c
+++ b/pimd/pim_static.c
@@ -20,6 +20,8 @@
   $QuaggaId: $Format:%an, %ai, %h$ $
 */
 
+#include <zebra.h>
+
 #include "pim_static.h"
 #include "pim_time.h"
 #include "pim_str.h"