votequorum: Make sure cs_error_t is defined

Signed-off-by: Ferenc Wágner <wferi@niif.hu>
Reviewed-by: Jan Friesse <jfriesse@redhat.com>

include/corosync/votequorum.h

@@ -36,6 +36,8 @@
 #ifndef COROSYNC_VOTEQUORUM_H_DEFINED
 #define COROSYNC_VOTEQUORUM_H_DEFINED
 
+#include <corosync/corotypes.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif