Remove some files from installer Qt5 components

Adding lib/libQt5Bootstrap.a and mkspecs/modules/qt_lib_bootstrap.pri
to the list of files to be removed from the installers.

Also organizing the list a bit while we are it.

Task-number: QTBUG-31393
Change-Id: I726093f8fb719a0fa61f94c0aa50795d09fb5dbf
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Iikka Eklund <iikka.eklund@digia.com>