Texlive: fix #1068, #1069 by upgrading to texlive 2017 (#1072)

Texlive: fix #1068, #1069 by upgrading to texlive 2017 (#1072)

* texlive: enable makeindex and put man files and headers in proper location.

* texlive: use historic install-tl-unx.tar.gz version. (fixes #1068, #1069).

Also include profile.d/texlive.sh in package instead of creating it in termux-install-tl.

* texlive: remove files from old installation script preinst.

* texlive: remove bin/custom and texmf-dist prerm

* texlive: improve sed patch.

Otherwise, running termux-install-tl twice fails.

* texlive: use proper sys-man dir and sys-info dir.

* texlive: propose me as maintainer

* texlive: upgrade to 2017

* texlive: add gnupg to dep to allow tlmgr to check downloaded packages