Remove all "#undef QT_NO_FOREACH" white-listing from source files.
Previous commits have removed all remaining Q_FOREACH/foreach uses in
this sub-tree.
Also remove one source file from NO_PCH_SOURCES in CMakeLists.txt.
Task-number: QTBUG-115839
Change-Id: I02cf994eda720c028e613407342fbd6658fa62b1
Reviewed-by: Marc Mutz <marc.mutz@qt.io>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>