Avoid host toolchain copy to target toolchain dir in canadian build

After https://android-review.googlesource.com/#/c/88662/ in mingw build
host toolchain put into the same directory as target. This patch fixes
this issue.

Change-Id: I8cb08fdfc9f8a3eb1b88ba982ebeb79c851b25d8
Signed-off-by: Pavel Chupin <pavel.v.chupin@intel.com>
Merge branch 'master' of https://android.googlesource.com/toolchain/build