https://issues.dlang.org/show_bug.cgi?id=15958

          Issue ID: 15958
           Summary: Missing extern(Windows) of core.sys.windows functions
           Product: D
           Version: D2
          Hardware: All
                OS: Windows
            Status: NEW
          Severity: normal
          Priority: P1
         Component: druntime
          Assignee: nobody@puremagic.com
          Reporter: jiki@red.email.ne.jp

Win32 bindings came with 2.070.
So most functions in those modules have extern(Windows) linkages,
but some of them misses.

The wrong linkage seems to get link failure.

I'll send a PR for them.

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