Fix a chicken-and-egg problem: this files implements SSP support,

so we cannot compile it with -fstack-protector[-all] flags (or
it will self-recurse); this is ensured in sys/conf/files.  This
OTOH means that checking for defines __SSP__ and __SSP_ALL__ to
determine if we should be compiling the support is impossible
(which it was trying, resulting in an empty object file).  Fix
this by always compiling the symbols in this files.  It's good
because it allows us to always have SSP support, and then compile
with SSP selectively.

Repoted by:	tinderbox

sys/kern/stack_protector.c

@@ -7,7 +7,6 @@ __FBSDID("$FreeBSD$");
 #include <sys/systm.h>
 #include <sys/libkern.h>
 
-#if defined(__SSP__) || defined(__SSP_ALL__)
 long __stack_chk_guard[8] = {};
 void __stack_chk_fail(void);
 
@@ -31,5 +30,3 @@ __stack_chk_init(void *dummy __unused)
 }
 /* SI_SUB_EVENTHANDLER is right after SI_SUB_LOCK used by arc4rand() init. */
 SYSINIT(stack_chk, SI_SUB_EVENTHANDLER, SI_ORDER_ANY, __stack_chk_init, NULL);
-
-#endif