include sys/sysmacros.h for major/minor macro definitions

Upstream-Status: Pending
Signed-off-by: Khem Raj <raj.khem@gmail.com>
--- a/mdadm.h
+++ b/mdadm.h
@@ -35,6 +35,7 @@ extern __off64_t lseek64 __P ((int __fd,
 
 #include	<sys/types.h>
 #include	<sys/stat.h>
+#include	<sys/sysmacros.h>
 #include	<stdint.h>
 #include	<stdlib.h>
 #include	<time.h>
