Move not cross-satisfiable dependencies to B-D-Indep

debian/control

@@ -15,10 +15,11 @@ Build-Depends: debhelper-compat (= 13),
                librhash-dev,
                libuv1-dev (>= 1.10),
                procps [!hurd-any],
-               python3-sphinx,
-               python3-sphinxcontrib.qthelp | python3-sphinx (<< 2.0),
                qtbase5-dev <!stage1>,
                zlib1g-dev
+Build-Depends-Indep: python3-sphinx,
+                     python3-sphinxcontrib.qthelp | python3-sphinx (<< 2.0),
+                     dh-sequence-sphinxdoc
 Rules-Requires-Root: no
 Standards-Version: 4.6.0
 Vcs-Git: https://salsa.debian.org/cmake-team/cmake.git
@@ -92,6 +93,7 @@ Package: cmake-doc
 Architecture: all
 Multi-Arch: foreign
 Section: doc
+Built-Using: ${sphinxdoc:Built-Using}
 Depends: ${misc:Depends}, ${sphinxdoc:Depends}, cmake-data (= ${source:Version})
 Recommends: doc-base
 Suggests: cmake

debian/rules

@@ -70,4 +70,4 @@ override_dh_sphinxdoc:
 	dh_sphinxdoc -pcmake-doc
 
 %:
-	dh $@ --with=sphinxdoc --builddirectory=Build
+	dh $@ --builddirectory=Build