Clean up the use of QT_NODLL

Clean up the use of QT_NODLL

QT_NODLL is replaced by QT_STATIC, but the latter is implied if
QT_BOOTSTRAPPED is already defined. Therefore, simply remove the
QT_NODLL definitions.

Change-Id: Iac7ec0b494b7a78197c25d59547f45eaf92d7465
Reviewed-by: Mark Brand <mabrand@mabrand.nl>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>