Add support for multiple bors targets.

[Alexhuszagh]

Allow using bors try --target ... --target ..., allowing multiple arguments rather than just a single one.

[Alexhuszagh]

bors try --target thumbv7em-none-eabihf --target thumbv7m-none-eabi

[bors]

try

Build failed:

• conclusion

[otavio]

I am not confortable with bors so I prefer someone else check if sounds good as well prior merging.

[Alexhuszagh]

@otavio Let's wait for the bors try --target ... --target ... to pass before merging.

[Alexhuszagh]

bors try --target thumbv7em-none-eabihf --target thumbv7m-none-eabi

[Emilgardis]

I am not confortable with bors so I prefer someone else check if sounds good as well prior merging.

don't leave a approval if that is the case <3

t

[Alexhuszagh]

Ok this properly builds only those two targets. This should also work for wildcards, since the syntax is '.[] | select(. == "*at")', which means we could provide --target armv7-* for all ARMv7 targets, or we could even select ARMv7 HF targets with --target armv7-*hf.

[bors]

try

Build succeeded:

• conclusion

[Emilgardis]

bors try --target notarget

[Emilgardis]

bors r+

[bors]

try

Build failed:

• conclusion

[bors]

Build succeeded:

• conclusion