Adding use_system_libusb option for third_party/libusb

tools/checklicenses/checklicenses.py

Index: tools/checklicenses/checklicenses.py
diff --git a/tools/checklicenses/checklicenses.py b/tools/checklicenses/checklicenses.py
index 7e465d6462d58f3268ab123c1970df684e168bc8..a0c15602b75939a5fbbcea4b2b73eab189245fe9 100755
--- a/tools/checklicenses/checklicenses.py
+++ b/tools/checklicenses/checklicenses.py
@@ -245,19 +245,19 @@ PATH_SPECIFIC_WHITELISTED_LICENSES = {
     ],
 
     # The following files lack license headers, but are trivial.
-    'third_party/libusb/libusb/os/poll_posix.h': [
+    'third_party/libusb/src/libusb/os/poll_posix.h': [
         'UNKNOWN',
     ],
-    'third_party/libusb/libusb/version.h': [
+    'third_party/libusb/src/libusb/version.h': [
         'UNKNOWN',
     ],
-    'third_party/libusb/autogen.sh': [
+    'third_party/libusb/src/autogen.sh': [
         'UNKNOWN',
     ],
-    'third_party/libusb/config.h': [
+    'third_party/libusb/src/config.h': [
         'UNKNOWN',
     ],
-    'third_party/libusb/msvc/config.h': [
+    'third_party/libusb/src/msvc/config.h': [
         'UNKNOWN',
     ],