Bump __FreeBSD_version to reflect the availability of capabilities, but
also capability-related changes to fget(9).  This is likely not part of
a formal KPI, but the nvidia driver (at least) uses it.

Approved by:	re (xxx)

Index: param.h
===================================================================
--- param.h	(revision 224814)
+++ param.h	(working copy)
@@ -58,7 +58,7 @@
  *		in the range 5 to 9.
  */
 #undef __FreeBSD_version
-#define __FreeBSD_version 900040	/* Master, propagated to newvers */
+#define __FreeBSD_version 900041	/* Master, propagated to newvers */
 
 #ifdef _KERNEL
 #define	P_OSREL_SIGSEGV		700004