[riot-notifications] [RIOT-OS/RIOT] makefiles/arch/riscv.inc.mk: Detect target triple (#15391)

[Marian Buschsieweke]

### Contribution description

This improves the target triple detection logic to include all possible target triples of compilers that might be able to generate our binaries.

### Testing procedure

`make BOARD=hifive1 -C exampes/default` should work if you have a GCC cross compiler able of generating RISC-V binaries for embedded systems, no matter what variant of the target triple you chose.

### Issues/PRs references

Suggested by @nmeum in https://github.com/RIOT-OS/RIOT/pull/15176
You can view, comment on, or merge this pull request online at:

  https://github.com/RIOT-OS/RIOT/pull/15391

-- Commit Summary --

  * makefiles/arch/riscv.inc.mk: Detect target triple

-- File Changes --

    M makefiles/arch/riscv.inc.mk (38)

-- Patch Links --

https://github.com/RIOT-OS/RIOT/pull/15391.patch
https://github.com/RIOT-OS/RIOT/pull/15391.diff

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