Fix Base.libblas_name/Base.liblapack_name

On Windows they need to include the major soversion of libblastrampoline.

Author: giordano

base/Base.jl

@@ -186,9 +186,10 @@ end
 include(strcat((length(Core.ARGS)>=2 ? Core.ARGS[2] : ""), "build_h.jl"))     # include($BUILDROOT/base/build_h.jl)
 include(strcat((length(Core.ARGS)>=2 ? Core.ARGS[2] : ""), "version_git.jl")) # include($BUILDROOT/base/version_git.jl)
 
-# These used to be in build_h.jl and are retained for backwards compatibility
-const libblas_name = "libblastrampoline"
-const liblapack_name = "libblastrampoline"
+# These used to be in build_h.jl and are retained for backwards compatibility.
+# NOTE: keep in sync with `libblastrampoline_jll.libblastrampoline`.
+const libblas_name = "libblastrampoline" * (Sys.iswindows() ? "-5" : "")
+const liblapack_name = libblas_name
 
 # numeric operations
 include("hashing.jl")

stdlib/libblastrampoline_jll/src/libblastrampoline_jll.jl

@@ -18,6 +18,7 @@ artifact_dir = ""
 libblastrampoline_handle = C_NULL
 libblastrampoline_path = ""
 
+# NOTE: keep in sync with `Base.libblas_name` and `Base.liblapack_name`.
 const libblastrampoline = if Sys.iswindows()
     "libblastrampoline-5.dll"
 elseif Sys.isapple()