Always ignore the deprecated MAP_RENAME and MAP_NORESERVE flags to mmap().

Some old libraries may be used even with newer binaries (specifically the
Nvidia driver libraries).

Differential Revision:	https://reviews.freebsd.org/D1262
Reviewed by:	kib

sys/sys/param.h

@@ -81,7 +81,6 @@
 #define	P_OSREL_SIGSEGV		700004
 #define	P_OSREL_MAP_ANON	800104
 #define	P_OSREL_MAP_FSTRICT	1100036
-#define	P_OSREL_MAP_RENAME	1100039
 
 #define	P_OSREL_MAJOR(x)	((x) / 100000)
 #endif

sys/vm/vm_mmap.c

@@ -222,8 +222,7 @@ sys_mmap(td, uap)
 	/*
 	 * Ignore old flags that used to be defined but did not do anything.
 	 */
-	if (td->td_proc->p_osrel < P_OSREL_MAP_RENAME)
-		flags &= ~(MAP_RESERVED0020 | MAP_RESERVED0040);
+	flags &= ~(MAP_RESERVED0020 | MAP_RESERVED0040);
 	
 	/*
 	 * Enforce the constraints.