At the very lease, for Glibc we won't remove all the "extra" spaces. We have:
<!-- 5.4 EOL is Dec 2025
so for LFS 12.5 we may consider moving to 5.10.
Keep an extra whitespace here to align the trailing "\" in glibc
configure command if y < 10 in x.y. -->
<!ENTITY min-kernel "5.4 ">