Disable line ending conversion on Windows for bazel_to_cmake.

Avoids massive amounts of spurious diffs.
diff --git a/build_tools/bazel_to_cmake/bazel_to_cmake.py b/build_tools/bazel_to_cmake/bazel_to_cmake.py
index ed70b9c..1d64489 100755
--- a/build_tools/bazel_to_cmake/bazel_to_cmake.py
+++ b/build_tools/bazel_to_cmake/bazel_to_cmake.py
@@ -146,7 +146,7 @@
           copyright_line,
           allow_partial_conversion=allow_partial_conversion)
       if write_allowed:
-        with open(cmakelists_file_path, "wt") as cmakelists_file:
+        with open(cmakelists_file_path, "wt", newline="\n") as cmakelists_file:
           cmakelists_file.write(converted_text)
       else:
         print(converted_text, end="")