meson: use install_emptydir() and drop meson-make-symlink.sh

The script is mostly equivalent to 'mkdir -p' and 'ln -sfr'.
Let's replace it with install_emptydir() builtin function and
inline meson call.

tools/meson-make-symlink.sh

@@ -1,22 +0,0 @@
-#!/bin/sh
-# SPDX-License-Identifier: LGPL-2.1-or-later
-set -eu
-
-SOURCE="${1:?}"
-TARGET="${2:?}"
-
-if [ "${MESON_INSTALL_QUIET:-0}" = 1 ] ; then
-    VERBOSE=""
-else
-    VERBOSE="v"
-fi
-
-# this is needed mostly because $DESTDIR is provided as a variable,
-# and we need to create the target directory...
-
-mkdir -${VERBOSE}p "$(dirname "${DESTDIR:-}$TARGET")"
-if [ "$(dirname "$SOURCE")" = . ] || [ "$(dirname "$SOURCE")" = .. ]; then
-    ln -${VERBOSE}fs -T -- "$SOURCE" "${DESTDIR:-}$TARGET"
-else
-    ln -${VERBOSE}fs -T --relative -- "${DESTDIR:-}$SOURCE" "${DESTDIR:-}$TARGET"
-fi