Externals: Update libusb to 1.0.23-rc1

Now has support for isochronous transfers in the WinUSB backend,
which may or may not work better than the UsbDk backend.

Externals/libusb/msvc/libusb_sources

@@ -2,6 +2,8 @@
 TARGETNAME=libusb-1.0
 DLLDEF=..\libusb-1.0.def
 
+_NT_TARGET_VERSION=$(_NT_TARGET_VERSION_WINXP)
+
 !IFNDEF MSC_WARNING_LEVEL
 MSC_WARNING_LEVEL=/W3
 !ENDIF
@@ -12,12 +14,8 @@ USE_LIBCMT=1
 USE_MSVCRT=1
 !ENDIF
 
-!IFDEF WITH_USBDK
-BACKEND_DEFINES="/DUSE_USBDK"
-!ENDIF
-
 INCLUDES=..;..\..\msvc;$(DDK_INC_PATH)
-C_DEFINES= $(C_DEFINES) $(LIBUSB_DEFINES) $(BACKEND_DEFINES) /DDDKBUILD
+C_DEFINES=$(C_DEFINES) $(LIBUSB_DEFINES) /DDDKBUILD
 
 # http://jpassing.com/2009/10/21/ltcg-issues-with-the-win7amd64-environment-of-wdk-7600/
 # prevents the following error when using the 64 bit static lib with Visual Studio 2010:
@@ -28,18 +26,18 @@ C_DEFINES= $(C_DEFINES) $(LIBUSB_DEFINES) $(BACKEND_DEFINES) /DDDKBUILD
 #  an older compiler than other objects; rebuild old objects and libraries"
 USER_C_FLAGS=/GL-
 
-TARGETLIBS=$(SDK_LIB_PATH)\kernel32.lib
+TARGETLIBS=$(SDK_LIB_PATH)\advapi32.lib \
+           $(SDK_LIB_PATH)\kernel32.lib
 
 SOURCES=..\core.c \
 	..\descriptor.c \
+	..\hotplug.c \
 	..\io.c \
+	poll_windows.c \
 	..\strerror.c \
 	..\sync.c \
-	..\hotplug.c \
 	threads_windows.c \
-	poll_windows.c \
+	windows_nt_common.c \
 	windows_usbdk.c \
 	windows_winusb.c \
-	windows_usbdk.c \
-	windows_nt_common.c \
 	..\libusb-1.0.rc