The C API we've used so far underlies stronger restrictions regarding
path length than QFile. Since qmake is not bootstrapped anymore, we can
use QFile.
Task-number: QTBUG-99791
Change-Id: Ic7765b0c09a8aa07c208c1b1d02efe0c54bb44f2
Reviewed-by: Dominik Holland <dominik.holland@qt.io>
Reviewed-by: Alexey Edelev <alexey.edelev@qt.io>