Ruby

[ruby/yarp] Move efficient file reading using demand paging to librubyparser

• So it can be reused by the Fiddle backend, etc and not just the C extension.
• Add YP_STRING_MAPPED to use a consistent interface for yp_string_t.
  That way yp_string_free() can be used like for other string types.
• Fix handling of empty file for !HAVE_MMAP && !_WIN32

https://github.com/ruby/yarp/commit/e40bc35801