* [monotouch-test] Ignore a few tests in non-ARM64 simulators.
Some tests fail when running on an M1, but in a x64_86 mode, so just ignore
those unless we're running on ARM64 (this will currently exclude them on
x86_64 hardware too, but that'll eventually not be a problem anymore when
there's no more x86_64 hardware, and just checking for ARM64 is easier than
checking for x86_64 mode on an ARM64 CPU).
* Make more legacy projects unsafe.
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