seccomp: drop now bogus dependency on PROC_FS

seccomp is prctl(2)-driven now.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/Kconfig

@@ -1205,7 +1205,6 @@ config IRQBALANCE
 config SECCOMP
 	def_bool y
 	prompt "Enable seccomp to safely compute untrusted bytecode"
-	depends on PROC_FS
 	help
 	  This kernel feature is useful for number crunching applications
 	  that may need to compute untrusted bytecode during their
@@ -1213,7 +1212,7 @@ config SECCOMP
 	  the process as file descriptors supporting the read/write
 	  syscalls, it's possible to isolate those applications in
 	  their own address space using seccomp. Once seccomp is
-	  enabled via /proc/<pid>/seccomp, it cannot be disabled
+	  enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
 	  and the task is only allowed to execute a few safe syscalls
 	  defined by each seccomp mode.