when reading color syntax names or sorting filenames, use mbstrcasecmp()

instead of strcasecmp() to compare them, in case they're UTF-8


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@2734 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

src/files.c

@@ -2008,7 +2008,7 @@ int diralphasort(const void *va, const void *vb)
     if (!aisdir && bisdir)
 	return 1;
 
-    return strcasecmp(a, b);
+    return mbstrcasecmp(a, b);
 }
 
 /* Free the memory allocated for array, which should contain len