Correctly locate part range in which read data.

[mgautierfr]

May fix #https://github.com/kiwix/kiwix-android/issues/3827 (to check). Fix https://github.com/kiwix/kiwix-android/issues/3827

As describe in https://en.cppreference.com/w/cpp/algorithm/equal_range, equal_range is undefined behavior if bool(comp(elem, value)) does not imply !bool(comp(value, elem)).

This is the case here for exemple with :

• value = Range{min:10, max:10}

• elem = Range{min:10, max:11}

• comp(value, elem) => value.min < elem.min && value.max <= elem.min => 10 < 10 && 10 <= 10 => false && true => false

• comp(elem, value) => elem.min < value.min && elem.max <= value.min => 10 < 10 && 11 <= 10 => false && false => false

  lower_bound and upper_bound don't have such requirement on comp.

[kelson42]

This PR has been confirmed to fix the big (on kiwix-android). Waiting @veloman-yunkan review to merge and release.