src: fix build on NetBSD

Include missing cmath.h header.

Fixes: #59714
PR-URL: #59718
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Ulises Gascón <ulisesgascongonzalez@gmail.com>
Reviewed-By: Richard Lau <richard.lau@ibm.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: 0-wiz-0

src/tracing/traced_value.cc

@@ -9,6 +9,7 @@
 #include <unicode/utypes.h>
 #endif
 
+#include <cmath>
 #include <sstream>
 
 #include "node_metadata.h"