This was breaking muscle memory of people with
the us intl keyboard layout, for important keys
such as '. The unfortunate side-effect is that
our handling of <dead_acute> is a bit hampered
by sequences that don't fit the pattern. But
such is life.
Fixes: #3807
Update our compose sequences based on the current
update xorg Compose.pre file. Beyond that, remove
some deadkey sequences that we are now handling
(better) in code.