Export ssyconvf symbol

This was apparently missed in commit a836fe8 when adding the
LAPACK 3.7.0 symbols. We noticed when adding wrappers for 3.7.0
routines in SciPy. For more details, see
rgommers/scipy#143

Author: rgommers

exports/gensymbol

@@ -716,6 +716,7 @@ lapackobjs2z="$lapackobjs2z
 # functions added for lapack-3.7.0
 lapackobjs2s="$lapackobjs2s
     slarfy
+    ssyconvf
     strevc3
     sgelqt
     sgelqt3