Support cross debugging and runners on Android.

[Alexhuszagh]

Support the CROSS_DEBUG and CROSS_RUNNER environment variables for android runners.

This allows us to both get debugging information for the Android runner (similar to the Linux runner) and also use a native runner for Android (defaults to Qemu). It also fixes a minor bug where the Android runner was not used on armv7-linux-androideabi.

[Alexhuszagh]

bors try android

[bors]

try

Build failed:

• conclusion

[Alexhuszagh]

bors try --target android

[bors]

try

Build succeeded:

• conclusion

[Emilgardis]

lgtm

[Alexhuszagh]

bors r+

[Emilgardis]

fyi, try to use bors r=reviewer when someone else has reviewed but not explicitly done bors r+ themselves, doesn't really matter in our workflow but good to know 👍

[Alexhuszagh]

fyi, try to use bors r=reviewer when someone else has reviewed but not explicitly done bors r+ themselves, doesn't really matter in our workflow but good to know +1

Thank you, good to know.

[bors]

Build succeeded:

• conclusion