[premake] Formatting, cleanup

third_party/libusb.lua

@@ -3,7 +3,7 @@ project("libusb")
   uuid("5f8b5485-fde5-4a42-8a13-8545fcf6d25b")
   kind("StaticLib")
   language("C")
-  includedirs({"libusb/libusb/"})
+  includedirs({"libusb/libusb"})
 
   files({
     "libusb/libusb/core.c",
@@ -15,7 +15,7 @@ project("libusb")
   })
 
   filter({"platforms:Windows"})
-    includedirs({"libusb/msvc/"})
+    includedirs({"libusb/msvc"})
     files({
       "libusb/libusb/os/events_windows.c",
       "libusb/libusb/os/events_windows.h",