benchmarks/vkoverhead: Revert "exorcise -Werror and unbreak on armv7"

This reverts commit f95a776840b0d53d446a8f219ed6ed5a7b135029.

As discussed with jbeich, this fix may fix the build, but it doesn't
lead to a working port. Revert until a proper fix can be designed.

MFH: 2025Q4