Add test for use of Base.libblas_name

(cherry picked from commit a93ac54)

Author: giordano

stdlib/LinearAlgebra/test/blas.jl

@@ -4,6 +4,7 @@ module TestBLAS
 
 using Test, LinearAlgebra, Random
 using LinearAlgebra: BlasReal, BlasComplex
+using Libdl: dlsym, dlopen
 fabs(x::Real) = abs(x)
 fabs(x::Complex) = abs(real(x)) + abs(imag(x))
 
@@ -713,4 +714,11 @@ end
     end
 end
 
+# Make sure we can use `Base.libblas_name`.  Avoid causing
+# https://github.com/JuliaLang/julia/issues/48427 again.
+@testset "libblas_name" begin
+    dot_sym = dlsym(dlopen(Base.libblas_name), "cblas_ddot" * (Sys.WORD_SIZE == 64 ? "64_" : ""))
+    @test 23.0 === @ccall $(dot_sym)(2::Cint, [2.0, 3.0]::Ref{Cdouble}, 1::Cint, [4.0, 5.0]::Ref{Cdouble}, 1::Cint)::Cdouble
+end
+
 end # module TestBLAS