add execinfo for netbsd

[Emilgardis]

resolves #1345

[Emilgardis]

bors try --target netbsd*

[Emilgardis]

bors cancel

bors try --target *netbsd

[bors[bot]]

try

Already running a review

[Emilgardis]

bors try --target *netbsd

[bors[bot]]

try

Already running a review

[Emilgardis]

ah, need to wait

[bors[bot]]

try

Build failed:

• conclusion

[Emilgardis]

or not, it's the bug where cancel doesn't cancel try runs, manually canceled it now

bors try --target *netbsd

[bors[bot]]

try

Build failed:

• conclusion

[Emilgardis]

bors try --target *netbsd

[bors[bot]]

try

Build failed:

• conclusion

[Emilgardis]

bors try --target *netbsd

[bors[bot]]

try

Build failed:

• conclusion

[Emilgardis]

bors r+

[bors[bot]]

Build succeeded!

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• conclusion