caputils: fix compilation without pcap.

The extern declaration must be put outside the ifdef to match the
closing statement as well as surrounding al the functions.

Fixes: 2820156fbd (Move still *more* headers outside of extern "C".)

caputils/capture-pcap-util.h

@@ -11,6 +11,10 @@
 #ifndef __CAPTURE_PCAP_UTIL_H__
 #define __CAPTURE_PCAP_UTIL_H__
 
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
 #ifdef HAVE_LIBPCAP
 
 #include "wspcap.h"
@@ -26,10 +30,6 @@
  */
 #define MIN_PACKET_SIZE 1	/* minimum amount of packet data we can read */
 
-#ifdef __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-
 GList *get_interface_list(int *err, char **err_str);
 #ifdef HAVE_PCAP_REMOTE
 GList *get_remote_interface_list(const char *hostname, const char *port,