Revert "Remove unneeded close in rigctld, rotctld, ampctld"

This reverts commit 493f527043.

tests/ampctld.c

@@ -680,6 +680,8 @@ void *handle_socket(void *arg)
 handle_exit:
 #ifdef __MINGW32__
     closesocket(handle_data_arg->sock);
+#else
+    close(handle_data_arg->sock);
 #endif
     free(arg);
 

tests/rigctld.c

@@ -1043,6 +1043,14 @@ handle_exit:
     fclose(fsockin);
     fclose(fsockout);
 
+// for everybody else we close the handle after fclose
+#ifndef __MINGW32__
+    retcode = close(handle_data_arg->sock);
+
+    if (retcode != 0) { rig_debug(RIG_DEBUG_ERR, "%s: close(handle_data_arg->sock) %s\n", __func__, strerror(retcode)); }
+
+#endif
+
     free(arg);
 
 #ifdef HAVE_PTHREAD

tests/rotctld.c

@@ -693,6 +693,8 @@ void *handle_socket(void *arg)
 handle_exit:
 #ifdef __MINGW32__
     closesocket(handle_data_arg->sock);
+#else
+    close(handle_data_arg->sock);
 #endif
     free(arg);