Travis: remove MinGW package caching relicts

.travis.yml

@@ -6,7 +6,6 @@ dist: trusty
 sudo: required
 cache:
     directories:
-        - apt_mingw_cache
         - $HOME/.ccache
 matrix:
     include:

.travis/linux.win.download.sh

@@ -1,16 +0,0 @@
-#!/usr/bin/env bash
-
-set -e
-
-CACHE_DIR=$TRAVIS_BUILD_DIR/apt_mingw_cache/$1
-mkdir -p "$CACHE_DIR"
-
-pushd "$CACHE_DIR"
-
-# shellcheck disable=SC2086
-apt-get --print-uris --yes install $MINGW_PACKAGES | grep ^\' | cut -d\' -f2 > downloads.list
-wget -N --input-file downloads.list
-
-sudo cp ./*.deb /var/cache/apt/archives/
-
-popd