make shellQuoteWin() be more sparing with circumflexes
... as newer versions of nmake (and jom, for compatibility) have botched
circumflex processing (they simply don't do it when shortcutting the shell
evaluation).
as a side effect, the output is also more readable if the string contains
quotes.
Change-Id: I0506b59ceecb70da258c482f9973156b2803066d
Reviewed-by:
Joerg Bornemann <joerg.bornemann@theqtcompany.com>
(cherry picked from qtbase/cf38b12a27627161e6799a3883285d05bc6420e5)
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