Move all WINUSB-dependent functionality into AdbWinUsbApi.dll in order to
enable ADB on condition that WINUSB has not been installed.
In this patch set new file (adb_winusb_api.h) has been added where I moved
typedef that broke the build. Aso, adb_api.cpp and AdbWinApi.cpp were changed
to include that new header file.
BUG 2033924
To support both, WinUsb and Legacy driver APIs we need to abstract classes
that depend on driver API details and then implement two sets of the
actual classes: one for WinUsb, and another for the Legacy drivers, so
we can choose in runtime which objects should be instantiated, depending
on what type of driver we have underneath this API.
