Move sysdeps_win32 to C++.

Change-Id: I27ca41b64d62bb3611b3a39a5c3bb4377d0773bc
diff --git a/adb/Android.mk b/adb/Android.mk
index 01ccbd9..b3918cc 100644
--- a/adb/Android.mk
+++ b/adb/Android.mk
@@ -44,7 +44,7 @@
 
 LIBADB_windows_SRC_FILES := \
     get_my_path_windows.cpp \
-    sysdeps_win32.c \
+    sysdeps_win32.cpp \
     usb_windows.cpp \
 
 include $(CLEAR_VARS)