testing/b3sum: enable for armhf
Patchset from Eric Roshan-Eisner eric.d.eisner@gmail.com via aports #4090:
Previously the APKBUILD enabled neon instructions which are not supported for armv6.
Upstream has since added broken auto-detection of arm version, which unintentionally ignores the neon flag for armv6.
https://github.com/BLAKE3-team/BLAKE3/commit/0a0bb7126e9207d3bb3d9af0f0b5ae646d532cf2
Don't set the flag for armhf in case they "fix" this bug.