[bug #34832] enable tls variable in windows code for newish gcc

[Ozkan Sezer]

Follow-up Comment #2, bug #34832 (project make):

The patch enables thread local storage in map_windows32_error_to_string() not
only for MSVC, but also for gcc-built make binaries. It also constifies the
returned value from the function, because the returned string is always used
as read-only arguments in printf format strings.

As for the whitespace changes, I made the 'else' case of the function
consistent with its 'if' counterpart; can be simply ignored, of course.

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