Transition to LinearAlgebra.BLAS.libblastrampoline instead of Base.libblas_name (#589)

This change is in support of JuliaLang/julia#50699

Author: staticfloat

src/NNlib.jl

@@ -18,8 +18,6 @@ using Requires
 using Statistics
 using Statistics: mean
 
-const libblas = Base.libblas_name
-
 const Numeric = Union{AbstractArray{<:T}, T} where {T<:Number}
 
 # Include APIs

src/gemm.jl

@@ -3,6 +3,12 @@
 
 using LinearAlgebra.BLAS: get_num_threads, set_num_threads
 
+if isdefined(LinearAlgebra.BLAS, :libblastrampoline)
+    const libblas = LinearAlgebra.BLAS.libblastrampoline
+else
+    const libblas = Base.libblas_name
+end
+
 """
     gemm!()