libtool: add patch to remove help2man dependency

packages/devel/libtool/package.mk

@@ -33,5 +33,5 @@ PKG_IS_ADDON="no"
 
 PKG_AUTORECONF="no"
 
-PKG_CONFIGURE_OPTS_HOST="--enable-static --disable-shared HELP2MAN=/bin/true"
+PKG_CONFIGURE_OPTS_HOST="--enable-static --disable-shared"
 

packages/devel/libtool/patches/libtool-03-remove-help2man-dependency.patch

@@ -0,0 +1,26 @@
+diff -Naur a/Makefile.am b/Makefile.am
+--- a/Makefile.am	2015-01-20 07:34:33.000000000 -0800
++++ b/Makefile.am	2015-10-27 11:16:49.027497480 -0700
+@@ -406,22 +406,6 @@
+ 	$(AM_V_GEN)$(MAKEINFO) -P '$(srcdir)/doc' --no-headers \
+ 	    $(MAKEINFOFLAGS) -o '$@' '$(notes_texi)'
+ 
+-dist_man1_MANS		= $(libtool_1) $(libtoolize_1)
+-MAINTAINERCLEANFILES	+= $(dist_man1_MANS)
+-update_mans = \
+-  PATH=".$(PATH_SEPARATOR)$$PATH"; export PATH; \
+-  $(HELP2MAN) --output='$@'
+-
+-# It's wrong to make distributed files (e.g. $(libtool_1)) rely on
+-# files created in the build tree, so instead we regenerate the
+-# manual pages if the sources for the build-tree files we want to
+-# run have changed.
+-$(libtool_1): $(ltmain_sh)
+-	$(AM_V_GEN)$(update_mans) --help-option=--help-all libtool
+-$(libtoolize_1): $(libtoolize_in)
+-	$(AM_V_GEN)$(update_mans) libtoolize
+-
+-
+ ## ------------- ##
+ ## Installation. ##
+ ## ------------- ##