Adapt build system files to new header location.

core/clib/CMakeLists.txt

core/clib/Module.mk

core/newdelete/CMakeLists.txt

core/newdelete/Module.mk

core/unix/CMakeLists.txt

core/unix/Module.mk

io/io/CMakeLists.txt

io/io/Module.mk

proof/proofd/CMakeLists.txt