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>

It was pointed out in #11504 that the code in python_init_once.patch is
incorrect; the patch does not prevent newtInit() from being called more
than once (in fact it is called twice the first time initScreen() is
called).

Testing without the patch, using the example code from the corresponding
Debian bug report[1], did not result in any segfaults.

This removes the patch from the package build.

Supersedes #11504.

[1]: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=557960#5

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

Linker flag was missing.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

The path where python3-config is installed was changed in 64959a1d. This
updates that path for this package.

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

This also removes $(FPIC) from TARGET_CFLAGS.

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

Signed-off-by: Rosen Penev <rosenp@gmail.com>

From the README:
Newt is a programming library for color text mode, widget based user
interfaces.  Newt can be used to add stacked windows, entry widgets,
checkboxes, radio buttons, labels, plain text fields, scrollbars,
etc., to text mode user interfaces.  Newt is based on the slang library.

Adapted from the old packages feed:
https://git.openwrt.org/?p=openwrt/svn-archive/packages.git;a=tree;f=libs/newt

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