Make make-install-prefix a common option again.
I had made some build-system related options not automatically apply to modules with customized build systems (e.g. Qt, CMake, "custom"). But this seems like the kind of option we'd want to have in common, as noted in a bug report to me by Andre Wöbbeking, so make make-install-prefix apply to all build systems by default if it's a global option. This can, of course, still be overridden for individual modules or module-sets.
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