Add pythoncom26.dll to Python virtual environment.
Add pythoncom26.dll to Python virtual environment.

This was previously available in the system wide install of Python 2.6. Since the switch to Python 2.7 it is not available.

BUG=
R=etienneb@chromium.org, rogerm@chromium.org

Review URL: https://codereview.appspot.com/43520044

git-svn-id: db59699583a60be9a535cd09cdc9132301867226@1944 15e8cca8-e42c-11de-a347-f34a4f72eb7d

ericmckean/syzygy,ericmckean/syzygy,wangming28/syzygy,google/syzygy,google/syzygy,supriyantomaftuh/syzygy,supriyantomaftuh/syzygy,supriyantomaftuh/syzygy,Eloston/syzygy,Eloston/syzygy,google/syzygy,pombreda/syzygy,google/syzygy,sebmarchand/syzygy,wangming28/syzygy,pombreda/syzygy,sebmarchand/syzygy,supriyantomaftuh/syzygy,ericmckean/syzygy,sebmarchand/syzygy,ericmckean/syzygy,pombreda/syzygy,sebmarchand/syzygy,wangming28/syzygy,pombreda/syzygy,wangming28/syzygy,ericmckean/syzygy,sebmarchand/syzygy,pombreda/syzygy