Function ibcmp_utf8 

pub unsafe fn ibcmp_utf8(
    my_perl: *mut PerlInterpreter,
    s1: *const c_char,
    pe1: *mut *mut c_char,
    l1: UV,
    u1: bool,
    s2: *const c_char,
    pe2: *mut *mut c_char,
    l2: UV,
    u2: bool,
) -> bool

thx shim for crate::ibcmp_utf8.