Don't bail out when specifying custom Android NDK host

When specifying the NDK host on the command line or in
the environment, we should not just exit from the configure
script. I don't know why this is here. Left over from debugging?

Change-Id: Iea826ee163e466fcf72bf703da8870ef82e2e20d
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Paul Olav Tvete <paul.tvete@digia.com>
Fix detection of Android NDK Host in configure

We need to get the right paths here. The existence test
for the toolchain was also reversed, thus hiding the fact
that the path was wrong.

Change-Id: I8af564ef9b133d9e382fb2566c2fe66b31672604
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Paul Olav Tvete <paul.tvete@digia.com>
Make test.pl recurse through subdirectories

Only tested on Linux.

Task-number: QTBUG-29649
Change-Id: I3dd866b5cbb16ac04e10c87dcc0ebd64ea3cab37
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>