Add Sphinx workaround patch to 5.7 patches

Author: dmhacker

base/patches/5.7/empty.patch

@@ -0,0 +1,13 @@
+diff --git i/Documentation/conf.py w/Documentation/conf.py
+index 3c7bdf4cd31f..9a0ced58a3e9 100644
+--- i/Documentation/conf.py
++++ w/Documentation/conf.py
+@@ -36,7 +36,7 @@ needs_sphinx = '1.3'
+ # Add any Sphinx extension module names here, as strings. They can be
+ # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
+ # ones.
+-extensions = ['kerneldoc', 'rstFlatTable', 'kernel_include', 'cdomain',
++extensions = ['kerneldoc', 'rstFlatTable', 'kernel_include',
+               'kfigure', 'sphinx.ext.ifconfig', 'automarkup',
+               'maintainers_include']
+