Khaled Hosny d24fd71934 [feaLib] Fix building chained alt substitutions
Support was added in db49f20d6b2629e1ba25c4afd3fb60817387f3d6, but there
was only a parser test and no builder test, fix the build and add a
builder test based on the existing parser one.

Fixes https://github.com/fonttools/fonttools/issues/1901
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