Revert "lavu: add snprintf(), vsnprint() and strtod() replacements for MS runtime."

This reverts commit ba537202801d71711f1ef9306a6248dd2d426fa0.
A better implementation has been commited by the same author to qatar

Conflicts:

	configure

Found-by: jamal <jamrial@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
