kbuild: Add htmlreqs target to validate and render requirements

Kernel developers are used to build documentation with make htmldocs and
friends.

This adds a Makefile target to build the requirements document in a
similar fashion.

Signed-off-by: Tobias Deiminger <tobias.deiminger@linutronix.de>

Author: haxtibal

Documentation/Makefile

@@ -172,6 +172,9 @@ endif # HAVE_SPHINX
 refcheckdocs:
 	$(Q)cd $(srctree);scripts/documentation-file-ref-check
 
+htmlreqs:
+	strictdoc export $(srctree)
+
 cleandocs:
 	$(Q)rm -rf $(BUILDDIR)
 

Makefile

@@ -1799,7 +1799,7 @@ $(help-board-dirs): help-%:
 # ---------------------------------------------------------------------------
 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs htmldocs-redirects \
 	       epubdocs cleandocs linkcheckdocs dochelp refcheckdocs \
-	       texinfodocs infodocs
+	       texinfodocs infodocs htmlreqs
 PHONY += $(DOC_TARGETS)
 $(DOC_TARGETS):
 	$(Q)$(MAKE) $(build)=Documentation $@