use one variable for debug msg level in my patch.
refactor: move coc patch in the indenpendent function.

add new functions pre_syscallcoc() and post_syscallcoc() for coc patch.
Instead of writing in pre_syscalltime/post_syscalltime.

and making new function pre_syscall/post_syscall be a wrapper of coc and
time function, to be registered as callgrind_pre_syscall and post one.
support x86_64, which has different open/close syscall number.
test case use python2
add path_cmp policy to processing prefix ./
coc debug level to normal => 1
Merge branch 'master' of https://github.com/u1240976/callgrind