Mark CC_STACKPROTECTOR as being BROKEN

It's always been broken, but recent fixes actually made it do something,
and now the brokenness shows up as the resulting kernel simply not
working at all.

So it used to be that you could enable this config option, and it just
didn't do anything.  Now we'd better stop people from enabling it by
mistake, since it _does_ do something, but does it so badly as to be
unusable.

Code to actually make it work is pending, but incomplete and won't be
merged into 2.6.25 in any case.
Acked-by: NArjan van de Ven <arjan@infradead.org>
Acked-by: NSam Ravnborg <sam@ravnborg.org>
Cc: James Morris <jmorris@namei.org>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

arch/x86/Kconfig

@@ -1054,7 +1054,7 @@ config SECCOMP
 
 config CC_STACKPROTECTOR
 	bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
-	depends on X86_64 && EXPERIMENTAL
+	depends on X86_64 && EXPERIMENTAL && BROKEN
 	help
          This option turns on the -fstack-protector GCC feature. This
 	  feature puts, at the beginning of critical functions, a canary