Windows: updated build scripts.
Improved support for compiling dependencies. C sources depend a lot on the
host environment to be built ok.
Updated ua_classifier to be ok even if the build for the NIF fails.
build.cmd, start.cmd: erlang-oauth was moved
from deps/ to modules/mod_oauth/deps/
in commit 6cc80e2
Update build.cmd for renamed webmachine -> webzmachine.
build.cmd was left out of commit feca872.