Tweak bootstrap & CI #4988
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Tweak bootstrap & CI #4988
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Two changes, related inasmuch as they improve the time Cygwin takes on AppVeyor:
make coldbuild the compiler sequentially on Unix (Windows has always had-j). This is historical - the script dates from a time whenmake -jdidn't reliably work. This slows down our CI when the cache is invalid or the bootstrap moves forward and it unnecessarily slows down the base image builder.I'm very paranoid about changing the bootstrap script, so the AppVeyor fix should go to 2.1 and 2.0, but the parallel build change should not.