Move fastboot's Windows code to C++.

Change-Id: I92414594cbdbc1896402c6d950d890042f8df6cf
diff --git a/fastboot/Android.mk b/fastboot/Android.mk
index 6443a1f..825082d 100644
--- a/fastboot/Android.mk
+++ b/fastboot/Android.mk
@@ -40,7 +40,7 @@
 endif
 
 ifeq ($(HOST_OS),windows)
-  LOCAL_SRC_FILES += usb_windows.c util_windows.c
+  LOCAL_SRC_FILES += usb_windows.cpp util_windows.cpp
   EXTRA_STATIC_LIBS := AdbWinApi
   ifneq ($(strip $(USE_CYGWIN)),)
     # Pure cygwin case