ncsid: Fix build issue

IWYU

Change-Id: Ibd54f428ea8e6e5c9f9dfd2ec8da4fcfbafdb572
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/subprojects/ncsid/src/net_config.cpp b/subprojects/ncsid/src/net_config.cpp
index 8316837..97c6a43 100644
--- a/subprojects/ncsid/src/net_config.cpp
+++ b/subprojects/ncsid/src/net_config.cpp
@@ -14,6 +14,7 @@
 
 #include "net_config.h"
 
+#include <fmt/format.h>
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <unistd.h>