Accept that in --batch mode. Also in batch mode don't send the 0th arg. Related discussion: https://github.com/harfbuzz/harfbuzz/pull/3102
The axes in fvar are in arbitrary order, NOT sorted. Hence have to lsearch all entries. Fixes https://github.com/harfbuzz/harfbuzz/issues/1673 Fixes https://github.com/harfbuzz/harfbuzz/issues/2743 Test from https://github.com/ctrlcctrlv/FontForge-Higher-Order-Interpolation