Updating OpenFAST to use explicit lapack and blas libraries from Spack. (#6824)

* Updating OpenFAST to use explicit lapack and blas libraries from Spack.

* Simplifying openfast blas lib logic and fixes flake8 errors.

* Changing order of blas and lapack libs in openfast package.

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

@@ -56,7 +56,7 @@ class Openfast(CMakePackage):
     # Additional dependencies when compiling C++ library
     depends_on('mpi', when='+cxx')
     depends_on('yaml-cpp', when='+cxx')
-    depends_on('hdf5+mpi+cxx', when='+cxx')
+    depends_on('hdf5+mpi+cxx+hl', when='+cxx')
     depends_on('zlib', when='+cxx')
     depends_on('libxml2', when='+cxx')
 
@@ -79,6 +79,13 @@ def cmake_args(self):
                 'ON' if '+cxx' in spec else 'OFF'),
         ])
 
+        # Make sure we use Spack's blas/lapack:
+        blas_libs = spec['lapack'].libs + spec['blas'].libs
+        options.extend([
+            '-DBLAS_LIBRARIES=%s' % blas_libs.joined(';'),
+            '-DLAPACK_LIBRARIES=%s' % blas_libs.joined(';')
+        ])
+
         if '+cxx' in spec:
             options.extend([
                 '-DMPI_CXX_COMPILER:PATH=%s' % spec['mpi'].mpicxx,