fa872c9af397837bb17859b5f43adec71239682a depends: Fix id_string invocations (Carl Dong)
Pull request description:
Closes: #21242
```
Reproduced from depends/Makefile comment:
When invoking a shell, GNU Make special-cases exit code 127 (command not
found) by not capturing the output but instead passing it through. This
is not done for any other exit code.
Therefore, we require a "|| true" to avoid this behaviour when in an
environment where the build_* or host_* may not exist yet.
```
ACKs for top commit:
laanwj:
Concept and light code review ACK fa872c9af397837bb17859b5f43adec71239682a
Tree-SHA512: 9ce88381aec579d956572cf70c4f69dc5a3873f0d2af14a71cf24814192a89452b8280258bed8cca804e4bd2644db056d213ab733df46a10560a47079524d8ac
