[mbed-tls] Help with unexpected generic_sum result

Hello,

I was working on packaging up mbedtls for [tea, a new package manager](https://tea.xyz/) and ran into an error validating the built products. I was hoping maybe someone more knowledgeable could take a quick look.

I followed the homebrew formula here: https://github.com/Homebrew/homebrew-core/blob/af8e7e97432944a65c0f985132a73... Here's the PR for adding it to tea: https://github.com/teaxyz/pantry/pull/1822

For some reason I'm not getting the expected checksum from `generic_sum`. Any help would be much appreciated. Thanks!

-Joe