Altera build issues, code gen fix for containers with no time clients
tools/cdk/include/hdl/hdl-assembly.mk: remove unncessary override, and AllCores assignment
tools/cdk/include/hdl/hdl-core2.mk: remove unnecessary target-dependent AllCores assignment
tools/cdk/include/hdl/hdl-make.mk: change var name for actual cores to avoid target-dependent assignment
tools/cdk/include/hdl/quartus.mk: ditto
tools/cdk/include/hdl/xst.mk: ditto
tools/ocpigen/src/hdl-assembly.cxx: fix container codegen bug when no time clients in container