remove redundant sequences, and some unrelated ones

Merged Benno Schulenberg requested to merge benno/libx11:redundant-sequences into master

The first patch removes duplicate Khmer digraphs, already defined in the included file, fixing issue #160 (closed).

The second patch removes stray Khmer and Arabic sequences from the Amharic and Greek compose files.

Edited by Benno Schulenberg

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