Tidy up systemCaCertificates() function in OpenSSL backend

As pointed out by Marc Mutz in another review, the Android branches of
its #if-ery amounted to a complicated no-op, so simplify the #if-ery,
add a TODO and then simplify the code thereby freed of the need to
accommodate the #if-ery.

In the process, initialize a set of filenames with the two filenames
that we read certificates from after looping over the set, which might
have left those files being read twice.

Change-Id: I2ee4ee3c3cf40226ee6a50afd6127fa4a71d2834
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>

0 files changed, 0 insertions, 0 deletions