Avoid recommonmark dependency in RHEL builds

python-recommonmark and its dependencies are unwanted in RHEL.  This is
based on changes already in c9s.

0009-disable-recommonmark.patch

@@ -0,0 +1,38 @@
+From f4e2d711e5cfd8e357d770e2da7a114086ee8659 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Timm=20B=C3=A4der?= <tbaeder@redhat.com>
+Date: Thu, 22 Sep 2022 10:49:43 +0200
+Subject: disable recommonmark
+
+---
+ clang/docs/conf.py | 15 +--------------
+ 1 file changed, 1 insertion(+), 14 deletions(-)
+
+diff --git a/clang/docs/conf.py b/clang/docs/conf.py
+index b8a42018191a..912449a7f792 100644
+--- a/clang/docs/conf.py
++++ b/clang/docs/conf.py
+@@ -37,20 +37,7 @@ source_suffix = {
+     '.rst': 'restructuredtext',
+ }
+ 
+-try:
+-  import recommonmark
+-except ImportError:
+-  # manpages do not use any .md sources
+-  if not tags.has('builder-man'):
+-    raise
+-else:
+-  import sphinx
+-  if sphinx.version_info >= (3, 0):
+-    # This requires 0.5 or later.
+-    extensions.append('recommonmark')
+-  else:
+-    source_parsers = {'.md': 'recommonmark.parser.CommonMarkParser'}
+-  source_suffix['.md'] = 'markdown'
++import sphinx
+ 
+ # The encoding of source files.
+ #source_encoding = 'utf-8-sig'
+-- 
+2.37.1
+

clang.spec

@@ -75,6 +75,10 @@ Patch10:    fix-ieee128-cross.diff
 
 Patch11:    0001-Change-LLVM_COMMON_CMAKE_UTILS-usage.patch
 
+# RHEL specific patches
+# Avoid unwanted dependency on python-recommonmark
+Patch101:  0009-disable-recommonmark.patch
+
 %if %{without compat_build}
 # Patches for clang-tools-extra
 # See https://reviews.llvm.org/D120301
@@ -107,7 +111,9 @@ BuildRequires:	emacs
 BuildRequires:	python3-lit
 
 BuildRequires:	python3-sphinx
+%if %{undefined rhel}
 BuildRequires:	python3-recommonmark
+%endif
 BuildRequires:	libatomic
 
 # We need python3-devel for %%py3_shebang_fix
@@ -276,7 +282,7 @@ rm test/clang-tidy/checkers/altera/struct-pack-align.cpp
 	clang-include-fixer/find-all-symbols/tool/run-find-all-symbols.py
 
 %setup -q -n %{clang_srcdir}
-%autopatch -M200 -p2
+%autopatch -M%{?!rhel:100}%{?rhel:200} -p2
 
 # failing test case
 rm test/CodeGen/profile-filter.c