Make libusbp work on Windows; rework the Microsoft-specific bits of the

firmware to match. This does at least allow us to get rid of the patcher.

lib/usb/fluxengineusb.cc

@@ -3,6 +3,7 @@
 #include "protocol.h"
 #include "fluxmap.h"
 #include "bytes.h"
+#include "libusbp_config.h"
 #include "libusbp.hpp"
 #include "fmt/format.h"
 

lib/usb/usbfinder.h

@@ -1,6 +1,7 @@
 #ifndef USBSERIAL_H
 #define USBSERIAL_H
 
+#include "libusbp_config.h"
 #include "libusbp.hpp"
 
 struct CandidateDevice