Update LinearAlgebra.jl

Author: helgee

stdlib/LinearAlgebra/src/LinearAlgebra.jl

@@ -15,7 +15,7 @@ import Base: USE_BLAS64, abs, acos, acosh, acot, acoth, acsc, acsch, adjoint, as
     oneunit, parent, power_by_squaring, print_matrix, promote_rule, real, round, sec, sech,
     setindex!, show, similar, sin, sincos, sinh, size, size_to_strides, sqrt, StridedReinterpretArray,
     StridedReshapedArray, strides, stride, tan, tanh, transpose, trunc, typed_hcat, vec
-using Base: hvcat_fill, iszero, IndexLinear, _length, promote_op, promote_typeof,
+using Base: hvcat_fill, iszero, IndexLinear, promote_op, promote_typeof,
     @propagate_inbounds, @unsafe_pure, reduce, typed_vcat, has_offset_axes
 using Base.Broadcast: Broadcasted