Include errno.h in a few files

errno.h was removed from some common headers. A few files use
errno and need to include it. On at least some Linux distributions
(Rocky 8), it doesn't get pulled in by other headers.

epan/color_filters.c

@@ -16,6 +16,7 @@
 
 #include <glib.h>
 
+#include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>

epan/wslua/init_wslua.c

@@ -16,7 +16,9 @@
 
 #include "wslua.h"
 #include "init_wslua.h"
+
 #include <epan/dissectors/packet-frame.h>
+#include <errno.h>
 #include <math.h>
 #include <stdio.h>
 #include <epan/expert.h>

epan/wslua/wslua_dir.c

@@ -15,6 +15,7 @@
 /* WSLUA_MODULE Dir Directory Handling Functions */
 
 #include "wslua.h"
+#include <errno.h>
 #include <wsutil/file_util.h>
 
 WSLUA_CLASS_DEFINE(Dir,FAIL_ON_NULL("Dir")); /* A Directory object, as well as associated functions. */

epan/wslua/wslua_file_handler.c

@@ -15,6 +15,8 @@
 #include "config.h"
 
 #include "wslua_file_common.h"
+
+#include <errno.h>
 #include <wiretap/file_wrappers.h>
 
 /* WSLUA_CONTINUE_MODULE File */

plugins/epan/mate/mate_util.c

@@ -15,6 +15,8 @@
 
 #include "mate.h"
 #include "mate_util.h"
+
+#include <errno.h>
 #include <wsutil/file_util.h>
 
 

ui/commandline.c

@@ -12,6 +12,7 @@
 
 #include <glib.h>
 
+#include <errno.h>
 #include <string.h>
 #include <stdio.h>
 #include <stdlib.h>

ui/rtp_stream.c

@@ -13,6 +13,7 @@
 
 #include "config.h"
 
+#include <errno.h>
 #include <stdlib.h>
 #include <string.h>