Use man pages generated by help2man in the host build.

diff -u -r ../coreutils-8.24/Makefile.in ./Makefile.in
--- ../coreutils-8.24/Makefile.in	2015-07-03 17:23:13.000000000 -0400
+++ ./Makefile.in	2015-07-04 07:38:25.901795437 -0400
@@ -14242,31 +14242,7 @@
 @SINGLE_BINARY_FALSE@man/yes.1:       src/yes$(EXEEXT)
 
 .x.1:
-	$(AM_V_GEN)name=`echo $@ | sed 's|.*/||; s|\.1$$||'` || exit 1;	\
-	case $$name in							\
-	  install) prog='ginstall'; argv=$$name;;			\
-	     test) prog='['; argv='[';;					\
-		*) prog=$$name; argv=$$prog;;				\
-	esac;								\
-	rm -f $@ $@-t							\
-	  && t=$*.td							\
-	  && rm -rf $$t							\
-	  && $(MKDIR_P) $$t						\
-	  && (cd $$t && $(LN_S) '$(abs_top_builddir)/src/'$$prog$(EXEEXT) \
-				$$argv$(EXEEXT))			\
-	  && $(run_help2man)						\
-		     --source='$(PACKAGE_STRING)'			\
-		     --include=$(srcdir)/man/$$name.x			\
-		     --output=$$t/$$name.1				\
-		     --info-page='\(aq(coreutils) '$$name' invocation\(aq' \
-		     $$t/$$argv$(EXEEXT)				\
-	  && sed \
-	       -e 's|$*\.td/||g' \
-	       -e '/For complete documentation/d' \
-	       $$t/$$name.1 > $@-t			\
-	  && rm -rf $$t							\
-	  && chmod a-w $@-t						\
-	  && mv $@-t $@
+	cp $(top_srcdir)/../host-build/$@ $@
 .PHONY: check-root
 check-root:
 	$(MAKE) check TESTS='$(root_tests)' SUBDIRS=.