New review comment by classabbyamp on void-packages repository

https://github.com/void-linux/void-packages/pull/51024#discussion_r1657882855

Comment:
1. this should probably be `-D_FILE_OFFSET_BITS=64 -DLARGEFILE_SOURCE=1`
2. don't see why it can't be set on glibc too
3. don't need `+=`