two commits: remove 485 Greek compose sequences that cannot be typed

Benno Schulenberg requested to merge benno/libx11:fewer-tonic into master

The first patch removes 463 sequences that use code points in the range U+1F00..U+1FFF (the Greek Extended block). None of the keyboard layouts in xkeyboard-config contains any of these code points, so none of the sequences could be typed.

The second patch removes 22 sequences that use symbolic key names (for Greek accented letters) that are not present on any keyboard layout in xkeyboard-config, so none of these sequences could be typed either.

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