openblas: fix pkg-config alias name

Turns out the filename is important. It should be `cblas`, not
`openblas-cblas`.

(cherry picked from commit 408eacbc89)

pkgs/development/libraries/science/math/openblas/default.nix

@@ -140,7 +140,7 @@ stdenv.mkDerivation rec {
     # Write pkgconfig aliases. Upstream report:
     # https://github.com/xianyi/OpenBLAS/issues/1740
     for alias in blas cblas lapack; do
-      cat <<EOF > $out/lib/pkgconfig/openblas-$alias.pc
+      cat <<EOF > $out/lib/pkgconfig/$alias.pc
 Name: $alias
 Version: ${version}
 Description: $alias provided by the OpenBLAS package.