util-linux: Fix Python3 uuid build/rebuild issues

1) Python3 needs the util-linux:host dependency otherwise uuid support will
   leak over from the build host during a clean build, only to use util-linux:host
   for uuid support during a subsequent rebuild (which fails, because of #2)

2) util-linux:host needs -fPIC as this is what Python3 requires (clean builds
   work because of #1...)

3) Remove toolchain from util-linux:host to avoid a circular toolchain
   reference now that Python3 is also part of toolchain (via meson)

packages/lang/Python3/package.mk

@@ -10,7 +10,7 @@ PKG_LICENSE="OSS"
 PKG_SITE="http://www.python.org/"
 PKG_URL="http://www.python.org/ftp/python/$PKG_VERSION/${PKG_NAME::-1}-$PKG_VERSION.tar.xz"
 PKG_SOURCE_DIR="${PKG_NAME::-1}-$PKG_VERSION*"
-PKG_DEPENDS_HOST="zlib:host bzip2:host libffi:host"
+PKG_DEPENDS_HOST="zlib:host bzip2:host libffi:host util-linux:host"
 PKG_DEPENDS_TARGET="toolchain sqlite expat zlib bzip2 openssl Python3:host readline ncurses"
 PKG_SECTION="lang"
 PKG_SHORTDESC="python3: The Python3 programming language"

packages/sysutils/util-linux/package.mk

@@ -1,19 +1,21 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
 # Copyright (C) 2009-2016 Stephan Raue (stephan@openelec.tv)
+# Copyright (C) 2018-present Team LibreELEC (https://libreelec.tv)
 
 PKG_NAME="util-linux"
 PKG_VERSION="2.31"
 PKG_SHA256="f9be7cdcf4fc5c5064a226599acdda6bdf3d86c640152ba01ea642d91108dc8a"
 PKG_ARCH="any"
 PKG_LICENSE="GPL"
 PKG_URL="http://www.kernel.org/pub/linux/utils/util-linux/v${PKG_VERSION%-*}/$PKG_NAME-$PKG_VERSION.tar.xz"
-PKG_DEPENDS_HOST="toolchain"
+PKG_DEPENDS_HOST=""
 PKG_DEPENDS_TARGET="toolchain"
 PKG_DEPENDS_INIT="toolchain"
 PKG_SECTION="system"
 PKG_SHORTDESC="util-linux: Miscellaneous system utilities for Linux"
 PKG_LONGDESC="The util-linux package contains a large variety of low-level system utilities that are necessary for a Linux system to function. Among many features, Util-linux contains the fdisk configuration tool and the login program."
 PKG_TOOLCHAIN="autotools"
+PKG_BUILD_FLAGS="+pic:host"
 
 UTILLINUX_CONFIG_DEFAULT="--disable-gtk-doc \
                           --disable-nls \