Fix up the dtrace/etw/systemtap infrastructure after the V8 upgrade in
commit 1c7bf24. The win32 changes are untested but can hardly make
things worse because node doesn't build on windows right now.
Fixes #7313 with some luck.
The DTrace probes were updated to accomodate platforms that can't
handle structs, update the prototypes for ETW but it's not necessary
to do anything with the new arguments as it's redundant information.
This commit enables ETW events to be fired on Windows for existing
DTrace probes. ETW instrumentation is enabled by default. It
is possible to build node.exe without ETW instrumentation by
using --without-etw option with configure script.