Repair STRINGIFY for Cray Fortran

Author: bonachea

include/assert_macros.h

@@ -14,7 +14,7 @@
 ! Deal with stringification issues:
 ! https://gcc.gnu.org/legacy-ml/fortran/2009-06/msg00131.html
 #ifndef STRINGIFY
-# ifdef __GFORTRAN__
+# if defined(__GFORTRAN__) || defined(_CRAYFTN)
 #  define STRINGIFY(x) "x"
 # else
 #  define STRINGIFY(x) #x