When one does:
	make SPHINXDIRS="foo" htmldocs

All patterns would be relative to Documentation/foo, which
causes the include/exclude patterns like:

	include_patterns = [
		...
		f'foo/*.{ext}',
	]

to break. This is not what it is expected. Address it by
adding a logic to dynamically adjust the pattern when
SPHINXDIRS is used.

That allows adding parsers for other file types.

It should be noticed that include_patterns was added on
Sphinx 5.1:
	https://www.sphinx-doc.org/en/master/usage/configuration.html#confval-include_patterns

So, a backward-compatible code is needed when we start
using it for real.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Reviewed-by: Donald Hunter <donald.hunter@gmail.com>
---
 Documentation/conf.py | 67 ++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 63 insertions(+), 4 deletions(-)

diff --git a/Documentation/conf.py b/Documentation/conf.py
index 12de52a2b17e..4ba4ee45e599 100644
--- a/Documentation/conf.py
+++ b/Documentation/conf.py

@@ -17,6 +17,66 @@ import os
 import sphinx
 import shutil
 
+# Get Sphinx version
+major, minor, patch = sphinx.version_info[:3]
+
+# Include_patterns were added on Sphinx 5.1
+if (major < 5) or (major == 5 and minor < 1):
+    has_include_patterns = False
+else:
+    has_include_patterns = True
+    # Include patterns that don't contain directory names, in glob format
+    include_patterns = ['**.rst']
+
+# Location of Documentation/ directory
+doctree = os.path.abspath('.')
+
+# Exclude of patterns that don't contain directory names, in glob format.
+exclude_patterns = []
+
+# List of patterns that contain directory names in glob format.
+dyn_include_patterns = []
+dyn_exclude_patterns = ['output']
+
+# Properly handle include/exclude patterns
+# ----------------------------------------
+
+def update_patterns(app):
+