MAINT: linalg: fortran lapack/blas are always available, cblas/clapac…

…k are always only partial

Remove some dead code substituting cblas/lapack with fblas/lapack if one
of them is not available.  This doesn't actually do anything, since the
Fortran BLAS/LAPACK is always available. Moreover the C blas/lapack are
only partial wrappers.

scipy/linalg/blas.py

@@ -107,19 +107,11 @@
 
 import numpy as _np
 
-# The following ensures that possibly missing flavor (C or Fortran) is
-# replaced with the available one. If none is available, exception
-# is raised at the first attempt to use the resources.
-
 from scipy.linalg import _fblas
 try:
     from scipy.linalg import _cblas
 except ImportError:
     _cblas = None
-if _cblas is None:
-    _cblas = _fblas
-elif hasattr(_fblas, 'empty_module'):
-    _fblas = _cblas
 
 # Expose all functions (only fblas --- cblas is an implementation detail)
 empty_module = None

scipy/linalg/lapack.py

@@ -200,9 +200,6 @@
 
 __all__ = ['get_lapack_funcs']
 
-# The following ensures that possibly missing flavor (C or Fortran) is
-# replaced with the available one. If none is available, exception
-# is raised at the first attempt to use the resources.
 from blas import _get_funcs
 
 # Backward compatibility:
@@ -214,11 +211,6 @@
 except ImportError:
     _clapack = None
 
-if _clapack is None:
-    _clapack = _flapack
-elif hasattr(_flapack,'empty_module'):
-    _flapack = _clapack
-
 # Expose all functions (only flapack --- clapack is an implementation detail)
 empty_module = None
 from scipy.linalg._flapack import *