Speed up package_build by using symlink/hardlinks on Windows
Speed up package_build by using symlink/hardlinks on Windows

File symlinks aren't handled properly by 7-Zip per
http://sourceforge.net/p/sevenzip/bugs/1016/ (and this is confirmed
by local testing).

It does handle directory symlinks properly. So, we use hardlinks
for files, and symlinks for directories. In a test run, this sped
up building the staging dir from 5.5minutes to ~1s.

R=iannucci@chromium.org
BUG=418702

Review URL: https://codereview.chromium.org/611213002

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@292231 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build