file.c: add some endif labels where appropriate

"Appropriate" for me being ifdefs which:

1) span enough lines to be hard-to-follow (I need big fonts to see)

2) nested within other ifdefs, or within large functions
   (I have a short attention span)

rb_file_expand_path_internal is the prime example of a large
function I struggle to understand due to the amount of
platform-specific ifdefs.  Hopefully this helps others with poor
vision and/or short attention spans.

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