When glibc support for nios2 was submitted upstream, we were asked to 
change the ptrace register query interface from 
PTRACE_GETREGS/PTRACE_SETREGS to PTRACE_GETREGSET/PTRACE_SETREGSET. 
This patch makes the corresponding change to gdbserver (there is no 
native GDB support for this target yet).

OK to commit?

-Sandra