libstdc++/3149: Ready 275: Wrong type in num_get::get() overloads

[Benjamin Kosnik]

> Cool.  Is the bool overload for get and do_get a gcc-ism?

No, there has to be a bool overload in case boolalpha == true, capice? I 
believe the current code is standards-conforming, especially WRT the 
num_get DR's. 

See: 

22.2.2.1 - Template class num_get [lib.locale.num.get]

-benjamin