New review comment by sgn on void-packages repository

https://github.com/void-linux/void-packages/pull/23249#discussion_r452554495

Comment:
Those flags are set by `gnu-configure`:

https://github.com/void-linux/void-packages/blob/ab8ff2e758d8d8d9314c296596ad86dca4e417a7/common/environment/configure/gnu-configure-args.sh#L7-L17
https://github.com/void-linux/void-packages/blob/ab8ff2e758d8d8d9314c296596ad86dca4e417a7/common/environment/configure/gnu-configure-args.sh#L37