Android: Report error when OpenSSL is on and headers are missing

There was an override for Android which would disable the configure
error when doing an OpenSSL build without having the headers
available. This has several times lead to packaging errors where
OpenSSL gets disabled but it's not noticed before the package testing,
which delays the process.

I'm not 100% sure of the reasoning behind the override, but I think
it's a left-over from Necessitas where OpenSSL was statically linked
into Qt.

Change-Id: I2bdc33fb60c59cd493987959d4bbbbb4e9735a92
Task-number: QTBUG-42851
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@theqtcompany.com>
Reviewed-by: BogDan Vatra <bogdan@kde.org>
Reviewed-by: Kai Koehne <kai.koehne@theqtcompany.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>