Typo fix.

Author: davidgiven

dep/build.py

@@ -236,7 +236,6 @@
                 "CLI/App.hpp",
                 "CLI/ExtraValidators.hpp",
                 "CLI/ConfigFwd.hpp",
-                "CLI/impl",
                 "CLI/impl/Encoding_inl.hpp",
                 "CLI/impl/Config_inl.hpp",
                 "CLI/impl/Split_inl.hpp",