*: 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_version.c b/pimd/pim_version.c
index fe7e563..f3a5ee3 100644
--- a/pimd/pim_version.c
+++ b/pimd/pim_version.c
@@ -20,6 +20,8 @@
   $QuaggaId: $Format:%an, %ai, %h$ $
 */
 
+#include <zebra.h>
+
 #include "pim_version.h"
 
 const char * const PIMD_VERSION = PIMD_VERSION_STR;