2f356a0ca8 scripted-diff: Drop Darwin version for better maintainability (Hennadii Stepanov)
Pull request description:
After this PR, any macOS tools version bumping in the future will touch fewer files in the repo.
Pointing a Darwin version for the `--host` system does not matter for the following reasons:
- in terms of the resulted binaries, we should only care about the minimum supported macOS version which is a separated parameter in our build system.
- in terms of the build system itself, the usage of the `$(host)` variable is self-consistent enough. Btw `$(host_os)` value already has the version dropped:
```
$ make -C depends --no-print-directory print-host_os HOST=x86_64-apple-darwin19
host_os=darwin
```
ACKs for top commit:
gruve-p:
ACK 2f356a0ca8
promag:
ACK 2f356a0ca8.
fanquake:
ACK 2f356a0ca8
Tree-SHA512: 374896ab0ba02b0d8b4b21431fe963bd213b0d09586e0898c13a4c5fa294c1b693f1b2c92880c245c4157c14217b4825b36522f461930477f4d2a727086ebb2a
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