fixup! Restructure @varnames_interface inclusion

src/generic/imports.jl

@@ -75,6 +75,7 @@ import ..AbstractAlgebra: @attributes
 import ..AbstractAlgebra: @enable_all_show_via_expressify
 import ..AbstractAlgebra: @show_name
 import ..AbstractAlgebra: @show_special
+import ..AbstractAlgebra: @varnames_interface
 import ..AbstractAlgebra: CacheDictType
 import ..AbstractAlgebra: CycleDec
 import ..AbstractAlgebra: Dedent