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Define supported architectures using check_architecture().
This replaces the awkward construction that was required for
armv6/armv7/armv7s, where we set the ARCH value to whatever the current
architecture was, if the current architecture was supported.
Add ARM64 support.
An ARCH value is required.
Normalize the ARCH handling across the two ARM trampoline definitions.
Enable armv7s support and bump the version to 1.0-beta2.
The fall back in pl_imp_removeBlock() calls the function recursively …
…instead of calling Apple's version.