Don't accidentally name anonymous module/class

b00f280d4b9569e7153365d7e1c522b3d6b3c6cf introduced
an accidental behavior change in that defining a module/class under
`m` gives `m` a name when `m` is anonymous.

`ruby -ve 'Module.new { class self::A; end; p name }'` outputs a name
similar to `Module#inspect` when it should output `nil` like in Ruby
2.6.x.

 * variable.c: Use `make_temporary_path` instead of `save_temporary_path`
   when getting the name of the parent module.

 * variable.c (rb_set_class_path): Delegate to `rb_set_class_path_string`
   instead of duplicating the logic.

[Bug #16097]

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