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- Use a sane (a.k.a. simply expanded) variable for the `$(TARGET_ARCH)`
instead of an insane (a.k.a. recursive expended) variable
- The toolchain detection will now happen only once, rather than
each and every time `$(TARGET_ARCH)` is referenced
- Use a single call to `which` rather than one per possible target
triple
Fixes https://github.com/RIOT-OS/RIOT/issues/19788