Fix rsp file escaping on Windows.

This commit removes the bad space-eating array->string serialization in response file generation. Instead, all array elements are enclosed in double-quotes " " to be able to preserve the array.

The same .rsp files are created by MSVC, which is why e.g. custom delimiter tricks or python array->string->array could not be used.

This pull request relates to issues #1471 and #1533.