build: Generate ip_asn.dat.h during build process

This can be disabled with -DWITH_EMBEDDED_ASMAP=OFF.

test/functional/test_framework/test_framework.py

@@ -1017,6 +1017,10 @@ class BitcoinTestFramework(metaclass=BitcoinTestMetaClass):
         """Checks whether the zmq module was compiled."""
         return self.config["components"].getboolean("ENABLE_ZMQ")
 
+    def is_embedded_asmap_compiled(self):
+        """Checks whether ASMap data was embedded during compilation."""
+        return self.config["components"].getboolean("ENABLE_EMBEDDED_ASMAP")
+
     def is_usdt_compiled(self):
         """Checks whether the USDT tracepoints were compiled."""
         return self.config["components"].getboolean("ENABLE_USDT_TRACEPOINTS")