[variations] Support multiple axes with same tag, aka HOI 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