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Generate lib/buildcustomize.pl at the same time as the miniperl executable.
Doing them together ensures that we always have lib/buildcustomize.pl
available. This simplifies things. The seemingly cranky ordering of having
miniperl notionally depend on lib/buildcustomize.pl, and the rule for
lib/buildcustomize.pl actually also building miniperl permits the rest of
the Makefile to depend on (the obvious) miniperl, not the obscure
lib/buildcustomize.pl