tst_rcc and tst_qdom rely on specific QHash orderings inside
rcc and QDom respectively (see QTBUG-25078 and QTBUG-25071).
A workaround is added to make them succeed: QDom checks for
all possible orderings, and rcc initializes the hash seed to 0
if the QT_RCC_TEST environment variable is set.
Change-Id: I5ed6b50602fceba731c797aec8dffc9cc1d6a1ce
Reviewed-by: João Abecasis <joao.abecasis@nokia.com>
Reviewed-by: Robin Burchell <robin+qt@viroteck.net>
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