[Issue 19438] New: Add `isNormalizedPath` to std.path

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19438

          Issue ID: 19438
           Summary: Add `isNormalizedPath` to std.path
           Product: D
           Version: D2
          Hardware: x86_64
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: dechcaudron+issues.dlang at pm.me

Just reporting for completion, fix is already implemented and will provide PR
ASAP. I addition to being a useful general-purpose function, it may be used in
the `in` contract blocks of functions in std.path expecting a normalized path
(see issue 13825).

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