Docs: clean up some DocBook loose ends

There were a few bits and pieces left over from the now-disused DocBook
toolchain; git rid of them.

Reported-by: Markus Heiser <markus.heiser@darmarit.de>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/scripts/Makefile b/scripts/Makefile
index 55550e4..c06f499 100644
--- a/scripts/Makefile
+++ b/scripts/Makefile
@@ -6,7 +6,6 @@
 # pnmttologo:    Convert pnm files to logo files
 # conmakehash:   Create chartable
 # conmakehash:	 Create arrays for initializing the kernel console tables
-# docproc:       Used in Documentation/
 
 HOST_EXTRACFLAGS += -I$(srctree)/tools/include
 
@@ -28,14 +27,12 @@
 always		:= $(hostprogs-y) $(hostprogs-m)
 
 # The following hostprogs-y programs are only build on demand
-hostprogs-y += unifdef docproc
+hostprogs-y += unifdef
 
 # These targets are used internally to avoid "is up to date" messages
-PHONY += build_unifdef build_docproc
+PHONY += build_unifdef
 build_unifdef: $(obj)/unifdef
 	@:
-build_docproc: $(obj)/docproc
-	@:
 
 subdir-$(CONFIG_MODVERSIONS) += genksyms
 subdir-y                     += mod