Disable manpages build and installation, seems the bundled version of
help2man is somewhat old and breaks on modern distributions such as
Fedora 20, as reported by Kanibal on IRC.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>

diff -Nura automake-1.14.1.orig/Makefile.in automake-1.14.1/Makefile.in
--- automake-1.14.1.orig/Makefile.in	2014-09-10 18:40:57.554164448 -0300
+++ automake-1.14.1/Makefile.in	2014-09-10 18:42:01.050348068 -0300
@@ -3387,7 +3387,7 @@
 check-am: all-am
 	$(MAKE) $(AM_MAKEFLAGS) check-TESTS check-local
 check: check-am
-all-am: Makefile $(INFO_DEPS) $(SCRIPTS) $(MANS) $(DATA)
+all-am: Makefile $(INFO_DEPS) $(SCRIPTS) $(DATA)
 installdirs:
 	for dir in "$(DESTDIR)$(bindir)" "$(DESTDIR)$(infodir)" "$(DESTDIR)$(man1dir)" "$(DESTDIR)$(amdir)" "$(DESTDIR)$(automake_acdir)" "$(DESTDIR)$(automake_internal_acdir)" "$(DESTDIR)$(docdir)" "$(DESTDIR)$(perllibdir)" "$(DESTDIR)$(pkgvdatadir)" "$(DESTDIR)$(scriptdir)" "$(DESTDIR)$(system_acdir)" "$(DESTDIR)$(perllibdir)"; do \
 	  test -z "$$dir" || $(MKDIR_P) "$$dir"; \
@@ -3454,7 +3454,7 @@
 	install-dist_automake_internal_acDATA install-dist_docDATA \
 	install-dist_perllibDATA install-dist_pkgvdataDATA \
 	install-dist_scriptDATA install-dist_system_acDATA \
-	install-info-am install-man install-nodist_perllibDATA
+	install-info-am install-nodist_perllibDATA
 	@$(NORMAL_INSTALL)
 	$(MAKE) $(AM_MAKEFLAGS) install-data-hook
 install-dvi: install-dvi-am