tc: remove dlfcn.h from files that dont need it

A bunch of source files look like they're copy & pasted from other files,
and some include header files that they don't actually need.  Since dlfcn
has very specific usage (and is a pain on a static-only system), drop it
where it isn't really needed.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

tc/em_cmp.c

@@ -18,7 +18,6 @@
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <string.h>
-#include <dlfcn.h>
 #include <errno.h>
 
 #include "m_ematch.h"

tc/em_meta.c

@@ -18,7 +18,6 @@
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <string.h>
-#include <dlfcn.h>
 #include <errno.h>
 
 #include "m_ematch.h"

tc/em_nbyte.c

@@ -18,7 +18,6 @@
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <string.h>
-#include <dlfcn.h>
 #include <errno.h>
 
 #include "m_ematch.h"

tc/em_u32.c

@@ -18,7 +18,6 @@
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <string.h>
-#include <dlfcn.h>
 #include <errno.h>
 
 #include "m_ematch.h"

tc/m_nat.c

@@ -19,7 +19,6 @@
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <string.h>
-#include <dlfcn.h>
 #include "utils.h"
 #include "tc_util.h"
 #include <linux/tc_act/tc_nat.h>

tc/m_xt.c

@@ -25,7 +25,6 @@
 #include "tc_util.h"
 #include <linux/tc_act/tc_ipt.h>
 #include <stdio.h>
-#include <dlfcn.h>
 #include <getopt.h>
 #include <errno.h>
 #include <string.h>