[Bug-ddrescue] Cannot compile with uClibc-ng

[Rosen Penev]

Build log of the issue:
https://downloads.openwrt.org/snapshots/faillogs/arc_arc700/packages/gddrescue/compile.txt

I've tried including extra headers but it doesn't work. Only thing
that works is to use the plain variants of fgetc, feof, and ferror.

>From looking at the uClibc-ng source code, I can't find a good reason
why this is not working. Interestingly enough, the other ones like
std::fopen work.