nls: delete twenty eight compose sequences that cannot be typed

Benno Schulenberg requested to merge benno/libx11:drop28 into master

The letters Ǫ (U+01EA, O with ogonek), Ȩ (U+0228, E with cedilla), Ȯ (U+022E, O with dot above), (U+1EA0, A with dot below), and their lowercase forms do not occur in any layout of xkeyboard-config, meaning that the compose sequences that contained these letters could not be typed. Delete their dead weight.

Signed-off-by: Benno Schulenberg

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