vendor: remove cpp_str and tags after usage

This will prevent this type of warning:

.sx/stupeflix/lib/python3.10/site-packages/setuptools/_distutils/extension.py:134:
 UserWarning: Unknown Extension options: 'cpp_std', 'tags' warnings.warn(msg)

It's wrong to forward the keyword 'cpp_std' and 'tags' to
cython.Extension and the latter is used to fill the
extra_compile_args in:

https://github.com/gopro/cython-setuptools/blob/main/cython_setuptools/vendor.py#L295-L296

cython_setuptools/vendor.py

@@ -203,6 +203,11 @@ def create_cython_ext_modules(cython_modules, profile_cython=False, debug=False)
                 args = kwargs.setdefault(args_name, [])
                 if "-g" not in args:
                     args.append("-g")
+        # Remove custom cython_setuptools options
+        if "cpp_std" in kwargs:
+            del kwargs["cpp_std"]
+        if "tags" in kwargs:
+            del kwargs["tags"]
         ext = Extension(**kwargs)
         ret.append(ext)
     return ret