sysctl net: Remove macro checks for CONFIG_SYSCTL

Since dccp and llc makefiles already check sysctl code
compilation with xxx-$(CONFIG_SYSCTL)
we can drop the checks

Signed-off-by: Denis Kirjanov <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

net/dccp/sysctl.c

···
 #include "dccp.h"
 #include "feat.h"
 
-#ifndef CONFIG_SYSCTL
-#error This file should not be compiled without CONFIG_SYSCTL defined
-#endif
-
 /* Boundary values */
 static int		u8_max   = 0xFF;
 static unsigned long	seqw_min = DCCPF_SEQ_WMIN,

net/llc/sysctl_net_llc.c

···
 #include <net/net_namespace.h>
 #include <net/llc.h>
 
-#ifndef CONFIG_SYSCTL
-#error This file should not be compiled without CONFIG_SYSCTL defined
-#endif
-
 static struct ctl_table llc2_timeout_table[] = {
 	{
 		.procname	= "ack",