rework doc

- drop linux-doc
- always build tools with docs

debian/rules.real

@@ -189,20 +189,6 @@ endif
 	rm -f $(INSTALL_DIR)/lib/modules/$(REAL_VERSION)/source
 	@$(stamp)
 
-$(STAMPS_DIR)/build-doc: DIR=$(BUILD_DIR)/build-doc
-# sphinx commands in /usr/bin are managed by the alternatives system.
-# Change $PATH to make sure we consistently use the Python 3 version.
-$(STAMPS_DIR)/build-doc: PATH:=/usr/share/sphinx/scripts/python3:$(PATH)
-$(STAMPS_DIR)/build-doc: $(STAMPS_DIR)/source
-ifeq (,$(filter nodoc,$(DEB_BUILD_PROFILES)))
-	mkdir -p '$(BUILD_DIR)'
-	rm -rf '$(DIR)'
-	$(call copy_source,$(DIR))
-	+$(MAKE_CLEAN) -C '$(DIR)' PYTHON=python3 xmldocs
-	+$(MAKE_CLEAN) -C '$(DIR)' PYTHON=python3 htmldocs
-endif
-	@$(stamp)
-
 define dh_binary_pre
 	dh_testroot
 	dh_prep
@@ -240,40 +226,6 @@ binary_meta:
 	$(dh_binary_pre)
 	$(dh_binary_post)
 
-build_doc: $(STAMPS_DIR)/build-doc
-
-binary_doc: DIR = $(BUILD_DIR)/build-doc
-binary_doc: OUT_DIR = $(DESTDIR)/usr/share/doc/$(PACKAGE_NAME)
-binary_doc: $(STAMPS_DIR)/build-doc
-	$(dh_binary_pre)
-ifeq (,$(filter nodoc,$(DEB_BUILD_PROFILES)))
-	mkdir -p $(OUT_DIR)
-	set -o pipefail; \
-	find CREDITS MAINTAINERS README Documentation \
-		-name '.gitignore' -prune -o -name DocBook -prune -o \
-		-path Documentation/media -prune -o \
-		-path Documentation/sphinx -prune -o \
-		-name 'Makefile*' -prune -o \
-		-print | \
-	cpio -pd --preserve-modification-time '$(OUT_DIR)'
-	set -o pipefail; \
-	cd $(DIR)/Documentation/output; \
-	find * -name '*.rst' -prune -o -name objects.inv -prune \
-		-o -name xml -prune -o -print | \
-	cpio -pd --preserve-modification-time '$(OUT_DIR)/html'
-	find $(OUT_DIR)/Documentation -type f | xargs gzip -9n
-# Fix up symlinks to gzipped docs
-	cd $(OUT_DIR)/Documentation; \
-	find -type l | while read link; do \
-		dest="$$(readlink -f "$$link")"; \
-		if [ -f "$$dest.gz" ]; then \
-			rm -f "$$link"; \
-			ln -sr "$$dest.gz" "$$link.gz"; \
-		fi; \
-	done
-endif
-	$(dh_binary_post)
-
 build_headers-common:
 
 binary_headers-common: PACKAGE_NAME_KBUILD = linux-kbuild-$(ABINAME)