Fixed OpenBSD build (missing header).

Change-Id: Idb34e5dc231760fa1b0eb8e28250c2f390b43f71

configure.ac

@@ -174,7 +174,7 @@ AC_SEARCH_LIBS([adler32], [z])
 
 # Checks for header files.
 AC_HEADER_RESOLV
-AC_CHECK_HEADERS_ONCE([cap-ng.h netinet/in_systm.h pthread_np.h signal.h sys/select.h sys/time.h sys/wait.h])
+AC_CHECK_HEADERS_ONCE([cap-ng.h netinet/in_systm.h pthread_np.h signal.h sys/select.h sys/time.h sys/wait.h sys/uio.h])
 
 # Checks for typedefs, structures, and compiler characteristics.
 AC_C_INLINE

src/knot/server/udp-handler.c

@@ -34,6 +34,9 @@
 #include <errno.h>
 #include <limits.h>
 #include <sys/param.h>
+#ifdef HAVE_SYS_UIO_H /* 'struct iovec' for OpenBSD */
+#include <sys/uio.h>
+#endif /* HAVE_SYS_UIO_H */
 #ifdef HAVE_CAP_NG_H
 #include <cap-ng.h>
 #endif /* HAVE_CAP_NG_H */