All Hydra builds on more recent kernels fail; from reading
the accelio documentation, I get the impression that 4.2 is
the most recent supported kernel version.
* Compile with gcc5 to avoid the compiler bug described in
https://gcc.gnu.org/ml/gcc-patches/2014-05/msg02560.html
* Add a patch to fix the many incorrect printf format specifiers and
other sloppy type conversions that gcc5 catches and warns on
(erroring out due to -Werror).
