relaxing the input for char-sets (allow definition strings which have less bits than the target, e.g. char const* input where target is wchar_t).

[SVN r60259]

libs/spirit

@@ -1 +1 @@
-Subproject commit 3d83d0439ab8909180e6d904d24f7412d4e1cb13
+Subproject commit b05a0801f3eec5961444a77978846000c2c8c03d