Increase speed for a build with no updates

On a reasonably fast machine with a decent config it takes
roughly 10 seconds to do a make where nothing is updated.
Generating one single Makefile is assumed to speed up things
and will in addition allow a simpler syntax as what is used today
for some of the uglier constructs.

Contact: Sam Ravnborg - sam (at) ravnborg.org

Difficulty: 5

Language: Perl or C
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CategoryKernelProjects