Added newer dfu-util for F4 DFU testing

tools/win/dfu-util-0.9-win64/README.txt

@@ -0,0 +1,26 @@
+dfu-util 0.9
+
+These binaries are for Microsoft Windows 64-bit
+
+They were built using MinGW-64 from MSYS2 with gcc 5.3.0,
+for build instructions please see:
+http://dfu-util.sourceforge.net/build.html
+
+Source code:
+https://sourceforge.net/p/dfu-util/dfu-util/ci/v0.9/tree/
+
+dfu-util.exe requires libusb-1.0.dll. The shipped libusb-1.0.dll
+is built from libusb 1.0.20 and can be replaced with another
+version if desired.
+
+dfu-util-static.exe has the libusb 1.0.20 code embedded and runs
+without any libusb-1.0.dll.
+
+Notes:
+1. To work around a bug in gcc/mingw, a small patch was applied, see
+   https://sourceforge.net/p/dfu-util/tickets/13/
+2. The dfu-util-static.exe includes libusb that has been patched
+   to work around a silicon bug in STM32F42X devices:
+   https://github.com/axoloti/axoloti/blob/master/platform_osx/src/libusb.stdfu.patch
+
+2016-02-11 Tormod Volden