This also removes PKG_BUILD_DIR, which does not need to be explicitly
set.

Signed-off-by: Jeffery To <jeffery.to@gmail.com>

This removes Python-related build variants, and adds
PYTHON3_PKG_BUILD:=0 and minor build adjustments (where appropriate),
for non-Python packages. There should be no changes to build output.

This also updates some include paths for python3-package.mk and/or
python3-host.mk to be relative to the package Makefile.

Signed-off-by: Jeffery To <jeffery.to@gmail.com>

This renames "internal" recipes to use the Python3/ prefix and clarifies
the names (RunTarget to Run, Mod to ModSetup, Shebang to FixShebang).

Signed-off-by: Jeffery To <jeffery.to@gmail.com>

HostPython3 only adds a few environment variables before running host
Python. It has only two users, Build/Compile/HostPy3RunHost and
Build/Compile/HostPy3RunTarget.

HostPython3 also accesses $(PYTHON3PATH), even though python3-host.mk
does not include python3-package.mk, where the variable is defined.

This removes HostPython3 and has its two users run host Python directly.
This also combines the environment variables of HostPython3 and the two
users into HOST_PYTHON3_VARS and PYTHON3_VARS.

Signed-off-by: Jeffery To <jeffery.to@gmail.com>

Signed-off-by: Peter Stadler <peter.stadler@student.uibk.ac.at>

Provide the minimal applications and plugins for: cgi, filelog, syslog and
python3. More plugins can be added if needed by other packages. Autostart
uwsgi in emperor mode loading vassals on demand.

For now, include luci-support (maybe it will be moved to another package),
which uses the syslog plugin by default.

Signed-off-by: Peter Stadler <peter.stadler@student.uibk.ac.at>