New comment by gspe on void-packages repository

https://github.com/void-linux/void-packages/pull/18873#issuecomment-597118155

Comment:
This template doesn't build python files and has unnecessary dependency `depends="boost python3" `

The follow template works, and should cross-compile:

```
# Template file for 'pybind11'
pkgname=pybind11
version=2.4.3
revision=1
build_style=cmake
configure_args="-D PYTHON_INCLUDE_DIR=ON -D PYBIND11_MASTER_PROJECT=ON -D PYBIND11_TEST=OFF"
hostmakedepends="python3-devel python3-setuptools"
makedepends="python3-devel"
short_desc="Seamless operability between C++11 and Python"
maintainer="Giuseppe Fierro <gspe@ae-design.ws>"
license="BSD-3-Clause"
homepage="https://pybind11.readthedocs.io"
distfiles="https://github.com/pybind/${pkgname}/archive/v${version}.tar.gz"
checksum=1eed57bc6863190e35637290f97a20c81cfe4d9090ac0a24f3bbf08f265eb71d

# build python package
post_build() {
	# cmake already install pybind11 headers
	export PYBIND11_USE_CMAKE=ON

	python3 setup.py build

	python3 setup.py install --prefix=/usr --root=${DESTDIR}
}

post_install() {
	vlicense LICENSE
}

```