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Help: Add cmake-buildsystem.7 manual.

Describe how to define a buildsystem of binary targets, how to
express dependencies between them, how to add build specifications,
how to specify usage requirements, transitive and compatible
propagation and the various pseudo targets.
Merge topic 'cmake-buildsystem-manual' into next

572be51 Help: Add cmake-buildsystem.7 manual.
cba6c45 CMake Nightly Date Stamp