This reverts commit 2b911758.

So that npm doesn't try to automatically compile and use it on an
`npm install` of the tarball.

No idea really if this helps anything...

This is how node does it so let's stay consistent.

they still contain absolute paths

Conflicts:
	src/async.h
	src/statement.h
	wscript

* remove 0.2.x Buffer compatibility

Conflicts:
	wscript