Fix for building tdegames-doc

Signed-off-by: ormorph <roma251078@mail.ru>

trinity-base/tdegames-doc/tdegames-doc-9999.ebuild

@@ -1,5 +1,5 @@
 # Copyright 1999-2020 Gentoo Authors
-# Copyright 2020 The Trinity Desktop Project
+# Copyright 2020-2021 The Trinity Desktop Project
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI="7"
@@ -15,3 +15,7 @@ fi
 RDEPEND="
 	~trinity-base/khelpcenter-${PV}"
 
+src_prepare() {
+	echo "tde_auto_add_subdirectories()" >"${S}/doc/CMakeLists.txt"
+	trinity-meta-2_src_prepare
+}