aacgain 1.9.0 and ffmpeg 4.0 binaries

These are static builds, which can be used with iTunesExport. Extract the archive and point iTunesExport to the folder by adding it in the executables search dialog.

aacgain version 1.9.0, derived from mp3gain version 1.5.2 copyright(c) 2001-2009 by Glen Sawyer AAC support copyright(c) 2004-2009 David Lasker, Altos Design, Inc. uses mpglib, which can be found at http://www.mpg123.de AAC support uses faad2 (http://www.audiocoding.com), and mpeg4ip's mp4v2 (http://www.mpeg4ip.net)

ffmpeg version 4.0-tessus Copyright (c) 2000-2018 the FFmpeg developers built with Apple LLVM version 9.1.0 (clang-902.0.39.1) configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl --enable-libass --enable-libbluray --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-version3 --pkg-config-flags=--static --disable-ffplay