Summary
- rebuild "verit" for arm64-linux for more robustness, e.g. relevant for theory "HOL-ex.BigO"; uniform baseline for "linux" and "linux_arm";
- proper os_name "linux" instead of "linux_arm" (amending a33a6e541cbb);
- proper bash syntax (amending 0631dfc0db07);
- tuned proof: avoid z3;
- tuned proof: avoid z3 to make it work on arm64-linux;
- tuned proofs --- avoid smt with external prover, which is somewhat unstable on arm64-linux;
- merged
- more robust check of ISABELLE_PLATFORM_FAMILY within settings environment, to support its reunification with Isabelle/Scala (see also a33a6e541cbb, f3a356c64193);
- strengthened class parity