nls: delete compose sequences that pointlessly mix upper and lower case

Benno Schulenberg requested to merge benno/libx11:case-mixes into master

It's nice to have compose sequences for things like © and ®, but allowing them to be composed also with letters of different case is unneeded. It is good enough to have sequences of only lowercase and only uppercase.

Signed-off-by: Benno Schulenberg

Edited by Benno Schulenberg

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