Remove manpage creation. It wasn't working because of help2man
missing when libtasn1 is being built. This attempt to create
manpages without help2man turns from no-op to hard error with
automake-1.13.
(From OE-Core rev: 0a9797c4c0409e26562b80f168409c3f86bc261c)
Signed-off-by: Marko Lindqvist <cazfi74@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>