PATCH: Fix breakage during last round of ABI tightening

[Benjamin Kosnik]

Thanks Loren!

>!     _ZNSt12__basic_fileIcE8sys_openE*St13_Ios_Openmode;
>      _ZNSt12__basic_fileIcE8sys_openEiSt13_Ios_Openmode;

This second line is now unnecessary.

-benjamin