* utils/hbmk2/hbmk2.prg
+ Rewritten dependency checking logic. New solution
integrates -reqheader, -inctrypath, -reqpkg options.
(Current parametrization and terminology is not final.)
The new engine supports dependency detection by package
name (via pkg-config/*-config), even multiple ones, by
key header file using custom header search paths, both
global and local. It also supports built-in detection
control as we know it from our GNU Make build system
via HBMK_WITH_* envvar (or one with customzed name)
which can have no/yes/nolocal/local/force values. This
implementation also supports optional dependencies.
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