cutchars don't seem to support unicode

[Alexander Tsepkov]

I've stumbled upon this while investigating an issue I had with urxvt
selecting tmux's vertical bar despite that bar being in cutchars. I checked
selection plugin and couldn't find anything that would cause this. I then
tried playing with some other unicode characters and saw that they get
ignored as well. Here is an example cutchars string:

URxvt.cutchars:                        "()*,;<>[]{}|`\"'#│☂"

The first few cutchars work fine, but both the last bar (tmux's separator)
and umbrella don't. I tried specifying them using \x representation, but
that caused the characters in the UTF code to get interpreted literally.
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