Fix dependencies for armv7 build

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 31%. Comparing base (dc1dd30) to head (ea8b5bd). Report is 9 commits behind head on master.

Files with missing lines	Patch %	Lines
src/piggui.rs	0%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #585 +/- ## ===================================== + Coverage 31% 31% +1% ===================================== Files 37 37 Lines 4807 4800 -7 ===================================== Hits 1450 1450 + Misses 3357 3350 -7 ``` | [Flag](https://app.codecov.io/gh/andrewdavidmackenzie/pigg/pull/585/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andrew+Mackenzie) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/andrewdavidmackenzie/pigg/pull/585/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andrew+Mackenzie) | `31% <0%> (+1%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andrew+Mackenzie#carryforward-flags-in-the-pull-request-comment) to find out more.

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