Expose function to test if a serial is TCP/IP

In practice, it just tests if the serial contains a ':', which is
sufficient to distinguish ip:port from a real USB serial.

PR #3005 <https://github.com/Genymobile/scrcpy/pull/3005>

app/src/adb/adb.h

@@ -93,4 +93,13 @@ sc_adb_get_serialno(struct sc_intr *intr, unsigned flags);
 char *
 sc_adb_get_device_ip(struct sc_intr *intr, const char *serial, unsigned flags);
 
+/**
+ * Indicate if the serial represents an IP address
+ *
+ * In practice, it just returns true if and only if it contains a ':', which is
+ * sufficient to distinguish an ip:port from a real USB serial.
+ */
+bool
+sc_adb_is_serial_tcpip(const char *serial);
+
 #endif