GNU/kFreeBSD portability fix. This glue <stdlib.h> overrides header protection

in the system-wide version of <stdlib.h> by wrapping the #include_next
<stdlib.h> within the scope of its own header protection. On FreeBSD this has
no effect, since both header protections are equivalent. However the GNU version
of <stdlib.h> implements a special header protection mechanism which allows it
to be included multiple times (in different modes).

Simply by moving the #include_next off the header protection, we allow
system-wide <stdlib.h> to implement its own protection policy, whichever that
may be.

cddl/compat/opensolaris/include/stdlib.h

@@ -27,11 +27,11 @@
  *
  */
 
+#include_next <stdlib.h>
+
 #ifndef _COMPAT_OPENSOLARIS_STDLIB_H_
 #define _COMPAT_OPENSOLARIS_STDLIB_H_
 
-#include_next <stdlib.h>
-
 #define getexecname	getprogname
 
 #endif