restore coverage lost in NotoColorEmoji transition

The following codepoints were previously provided by AndroidEmoji,
but are no longer present in our fallback chain. This commit restores
them by resurrecting a subset version of AndroidEmoji.ttf:

 U+25AB WHITE SMALL SQUARE
 U+25FB WHITE MEDIUM SQUARE
 U+25FC BLACK MEDIUM SQUARE
 U+25FD WHITE MEDIUM SMALL SQUARE
 U+25FE BLACK MEDIUM SMALL SQUARE
 U+2600 BLACK SUN WITH RAYS
 U+26AA MEDIUM WHITE CIRCLE
 U+26AB MEDIUM BLACK CIRCLE
 U+2757 HEAVY EXCLAMATION MARK SYMBOL
 U+2934 ARROW POINTING RIGHTWARDS THEN CURVING UPWARDS
 U+2935 ARROW POINTING RIGHTWARDS THEN CURVING DOWNWARDS
 U+2B05 LEFTWARDS BLACK ARROW
 U+2B06 UPWARDS BLACK ARROW
 U+2B07 DOWNWARDS BLACK ARROW
 U+2B1B BLACK LARGE SQUARE
 U+2B1C WHITE LARGE SQUARE
 U+2B50 WHITE MEDIUM STAR
 U+2B55 HEAVY LARGE CIRCLE
 U+303D PART ALTERNATION MARK

These characters see regular use in kaomoji constructions (and
elsewhere), and it really wouldn't do to lose them.

Bug: 10144988
Change-Id: I72b541aad01bc5ccac829be44ed259c461724142