We are not interested in testing FreeType cmap support.
Fixes most format 4 tests. The remaining test seems to be peculiar, and
I can’t find any cmap implementation that produces the expected output.
Annotated OpenType Specification or aots, https://github.com/adobe-type-tools/aots
provides a set of tests for OpenType specification, this change add those tests in addition
to modified version of their HarfBuzz test runner for generating harfbuzz project specific tests.