Update build.cmd for renamed webmachine -> webzmachine.
Update build.cmd for renamed webmachine -> webzmachine.

build.cmd was left out of commit feca8729f69036454e86c04331b4e496b51007cc.

erlanger-ru/erlanger-ru.meta,erlanger-ru/erlanger-ru.meta,erlanger-ru/erlanger-ru.meta,erlanger-ru/erlanger-ru.meta,erlanger-ru/erlanger-ru.meta