[Bug c++/70299] pow(long double, int) gives more imprecise result than pow(long double,long double) in c++03 mode

[b7.10110111 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70299

--- Comment #1 from Ruslan <b7.10110111 at gmail dot com> ---
The machine I tested it was Ubuntu 15.10, uname -a gives
Linux integral3-amd64 4.2.0-22-generic #27-Ubuntu SMP Thu Dec 17 22:57:08 UTC
2015 x86_64 x86_64 x86_64 GNU/Linux
, libc is Ubuntu GLIBC 2.21-0ubuntu4.