Remove oprofile flags in wscript.
Remove oprofile flags in wscript.

V8 3.1.5 (commit 550f73a) dropped oprofile support so don't pass
prof=oprofile to scons.

See http://codereview.chromium.org/6474037/

Fixes #998.

dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node