Bypass GDB bug which asks to read packet slightly too big
GDB sometimes asks slightly too big read packets
(no taking into account the packet overhead).
Bypass the problem by allocating slightly more than needed
if GDB would only ask the correct maximum size.



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13472 a5019735-40e9-0310-863c-91ae7b9d1cf9