Avoid deprecated BLAS.vendor() in MKL conflict check

Patch as suggested by Carsten Bauer in JuliaPy#922.

GitHub: Fixes JuliaPy#922.

Author: dnadlinger

src/numpy.jl

@@ -64,8 +64,8 @@ function npyinitialize()
     numpy = pyimport("numpy")
 
     # emit a warning if both Julia and NumPy are linked with MKL (#433)
-    if LinearAlgebra.BLAS.vendor() === :mkl &&
-       LinearAlgebra.BLAS.BlasInt === Int64 && hasproperty(numpy, "__config__")
+    julia_mkl = any(contains("mkl"), getfield.(BLAS.get_config().loaded_libs, :libname))
+    if julia_mkl && LinearAlgebra.BLAS.BlasInt === Int64 && hasproperty(numpy, "__config__")
         config = numpy."__config__"
         if hasproperty(config, "blas_opt_info")
             blaslibs = get(config."blas_opt_info", Vector{String}, "libraries", String[])