Use man pages generated by help2man in the host build.

diff -u -r ../coreutils-8.23/Makefile.in ./Makefile.in
--- ../coreutils-8.23/Makefile.in	2014-07-19 00:22:24.000000000 +0200
+++ ./Makefile.in	2014-07-29 15:52:14.000000000 +0200
@@ -14062,29 +14062,7 @@
 @AMDEP_TRUE@@am__include@ man/dynamic-deps.mk
 
 .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/'$$prog $$argv) \
-	  && $(run_help2man)						\
-		     --source='$(PACKAGE_STRING)'			\
-		     --include=$(srcdir)/man/$$name.x			\
-		     --output=$$t/$$name.1 $$t/$$argv			\
-		     --info-page='coreutils \(aq'$$name' invocation\(aq' \
-	  && 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=.