In addition to the fix, I've removed some legacy codes in the
`configure` file and delegated most of the work to
the `QtWriteArgsFile.cmake` which was being used by `configure.bat`. I
am not sure how this was supposed to work before since it was not really
working, but now, `config.opt` lives in the build directory, together
with `config.opt.in` (a template file), and the `config.redo` (and
`config.redo.in`) which holds the full redo command. The template files
are being used to preserve the quoted variables and to help
QtWriteArgFiles process the opt files more consistency.
Also fixed an issue on Unix, where ./configure was failing to run if
its path contained spaces, e.g., `Qt Src/qt5/configure`.
Fixes: QTBUG-108287
Change-Id: I9843b690a1fd3177a93e55e08a3484a4c85ba2e8
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
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