build: pin the build host and the shipped ABIs

The native scripts picked an NDK host tag for macOS as well, but
ci/setup-toolchain.sh provisions nothing outside Linux x86_64 and no
pipeline exercises the other branch. Fail with the message setup already
gives instead of naming a toolchain nobody can obtain here.

The armeabi-v7a and x86 cases were never reachable either: ABIS ships
arm64-v8a and x86_64, and ci/verify-apk.sh has no machine check for the
other two, so adding one to ABIS failed the build it was meant to
enable. Record what a new ABI actually costs instead of inviting a
one-line edit that cannot work.

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