Fix parallel "make install" of CMake itself

Avoid tracing dependencies of GLOBAL_TARGET targets.  The build system
generators are not designed to handle any dependencies that may be
discovered.  Global targets are only generated by CMake and never have
commands that reference targets built in the project anyway.

The exception is when building CMake itself there is a special case to
use the just-built "cmake" binary in the "install" target so that CMake
can replace itself on Windows.  Even in this special case we do not want
to let the "install" target depend on the "cmake" target.  Doing so
breaks cases like "make -j4 install".

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