move pkgs into submodule

pkgs/boost_1_78_0/INSTALL

-See ./index.html for information about this release. The "Getting Started" 
-section is a useful starting place.
-
----------------------------
-Copyright Beman Dawes, 2008
-
-Distributed under the Boost Software License, Version 1.0.
-See ./LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt 
\ No newline at end of file

pkgs/boost_1_78_0/LICENSE_1_0.txt

-Boost Software License - Version 1.0 - August 17th, 2003
-
-Permission is hereby granted, free of charge, to any person or organization
-obtaining a copy of the software and accompanying documentation covered by
-this license (the "Software") to use, reproduce, display, distribute,
-execute, and transmit the Software, and to prepare derivative works of the
-Software, and to permit third-parties to whom the Software is furnished to
-do so, all subject to the following:
-
-The copyright notices in the Software and this entire statement, including
-the above license grant, this restriction and the following disclaimer,
-must be included in all copies of the Software, in whole or in part, and
-all derivative works of the Software, unless such copies or derivative
-works are solely in the form of machine-executable object code generated by
-a source language processor.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
-SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
-FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
-ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
-DEALINGS IN THE SOFTWARE.

pkgs/boost_1_78_0/README.md

-# Boost C++ Libraries
-
-The Boost project provides free peer-reviewed portable C++ source libraries.
-
-We emphasize libraries that work well with the C++ Standard Library. Boost
-libraries are intended to be widely useful, and usable across a broad spectrum
-of applications. The Boost license encourages both commercial and non-commercial use
-and does not require attribution for binary use. 
-
-The project website is www.boost.org, where you can obtain more information and
-[download](https://www.boost.org/users/download/) the current release.

pkgs/boost_1_78_0/bin.v2/config.log

-...found 1 target...
-...found 1 target...
-...updating 1 target...
-config-cache.write bin.v2/project-cache.jam
-...updated 1 target...

pkgs/boost_1_78_0/bin.v2/standalone/ac/bzlib_h.cpp

-#include <bzlib.h>