some fixes to blas/lapack usage in packages (#1852)

* atlas: fix unit test

* openblas: remove symlinks; use lapack_libs.ld_flags in the test

* mkl: fix openmp variant of blas/lapack libs

* intel-parallel-studio: fix openmp variant of blas/lapack libs

* netlib-scalapack: fix blas/lapack for multilib case (e.g. mkl)

* arpack-ng: fix blas/lapack for multilib case (e.g. mkl)

* petsc: explicitly specify blas/lapack

* minor

* cantera: fix blas/lapack usage

* ipopt: fix blas/lapack usage

* netlib-lapack: fix external blas usage

* mfem: fix lapack/blas usage

* superlu-mt: fix blas usage

* flake8 fixes

var/spack/repos/builtin/packages/cantera/package.py

@@ -85,8 +85,9 @@ def install(self, spec, prefix):
 
         # BLAS/LAPACK support
         if '+lapack' in spec:
+            lapack_blas = spec['lapack'].lapack_libs + spec['blas'].blas_libs
             options.extend([
-                'blas_lapack_libs=lapack,blas',
+                'blas_lapack_libs={0}'.format(','.join(lapack_blas.names)),
                 'blas_lapack_dir={0}'.format(spec['lapack'].prefix.lib)
             ])