bug#21454: 25.0.93; `parse-colon-path' over dirs with 2 consecutive dir sep

[Tino Calancha]

There are 2 typos in previous report:

> B) path="$BAZ/bin" ; fails (FOO is not a directory file name)
Should be:
B) path="$BAZ/bin" ; fails (BAZ is not a directory file name)

> let ((foo "/foo/bar/baz/qux/:/quux/corge/:/grault/graply/waldo")) ; `ok'
>  (setenv "FOO" foo)
>  (parse-colon-path "$FOO"))
> ("/foo/bar/baz/qux/:/quux/corge/:/grault/graply/waldo/")
It's _not_ ok: `parse-colon-path' returns list with 1 element (don't split on 
':').


New patch applied over previous tests returns:

("/foo/bar/baz/" "/qux/quux/corge/")
("/foo/bar/baz/qux/" "/quux/corge/" "/grault/graply/waldo/")
("/foo/bar/baz/qux/" "/quux/corge/" "/grault/graply/waldo/")
("/foo/bar/baz/qux/" "/quux/corge/" "/grault/graply/waldo/")
("/foo/bar/baz/qux/" "/quux/corge/" "/grault/garply/waldo/")
("/foo/bar/baz/qux/" "/quux/corge/" "/grault/garply/waldo/")
("/foo/bar/baz/qux/" "/quux/corge/")
("/foo/bar/baz/qux/" "/quux/corge/")


In GNU Emacs 25.0.93.1 (x86_64-pc-linux-gnu, GTK+ Version 2.24.30)
 of 2016-04-25 built on calancha-pc
Repository revision: 0cd2e923dba8d8c7128b0c084ce6af22069e8db5

files.patch
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