wix: remove enum and future packages

These were cargo culted from the THG installer code. I'm not sure
what needs them in THG land. But the official MSIs certainly do
not - at least not as direct dependencies.

.. bc::

   The Windows MSI installers no longer include the enum and future
   Python packages.

Differential Revision: https://phab.mercurial-scm.org/D6101

contrib/packaging/hgpackaging/wix.py

@@ -37,7 +37,6 b' SUPPORT_WXS = ['
 
 EXTRA_PACKAGES = {
     'distutils',
-    'enum',
     'pygments',
 }
 

contrib/packaging/wix/requirements.txt

@@ -8,10 +8,6 b' docutils==0.14 \\'
     --hash=sha256:02aec4bd92ab067f6ff27a38a38a41173bf01bed8f89157768c1573f53e474a6 \
     --hash=sha256:51e64ef2ebfb29cae1faa133b3710143496eca21c530f3f71424d77687764274 \
     --hash=sha256:7a4bd47eaf6596e1295ecb11361139febe29b084a87bf005bf899f9a42edc3c6
-enum==0.4.7 \
-    --hash=sha256:8c7cf3587eda51008bcc1eed99ea2c331ccd265c231dbaa95ec5258d3dc03100
-future==0.17.1 \
-    --hash=sha256:67045236dcfd6816dc439556d009594abf643e5eb48992e36beac09c2ca659b8
 pygments==2.3.1 \
     --hash=sha256:5ffada19f6203563680669ee7f53b64dabbeb100eb51b61996085e99c03b284a \
     --hash=sha256:e8218dd399a61674745138520d0d4cf2621d7e032439341bc3f647bff125818d

contrib/packaging/wix/requirements.txt.in

@@ -1,4 +1,2 b''
 docutils
-enum
-future
 pygments