This moves the copy/strip/rm logic for the Windows SDK
from the patch_windows_sdk.sh to a regular sdk-windows-x86.atree.
The bash script is still here to invoke atree and do whatever
cleanup we might want to do later.
This should make it easier to maintain the Windows SDK
by providing a structure similar to tools.atree.
This change requires build.git Change-Id: I22aae7a8 to
have rm/strip support in atree.
Change-Id: If937eef4a819e7da21aa993459111fc5d99474a8
e07f59a612