Fix include paths for uvision when exported with Python 3.

The call to encode() was causing the include paths to be placed in the
uvision product file with the prefix "b'" and the postfix "'". This
broke the parsing of this file and broke the build.

tools/export/uvision/__init__.py

@@ -241,7 +241,7 @@ class Uvision(Exporter):
             'project_files': sorted(list(self.format_src(srcs).items()),
                                     key=lambda tuple: tuple[0].lower()),
             'include_paths': ';'.join(self.filter_dot(d) for d in
-                                      self.resources.inc_dirs).encode('utf-8'),
+                                      self.resources.inc_dirs),
             'device': DeviceUvision(self.target),
         }
         sct_name, sct_path = self.resources.get_file_refs(