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This reverts commit f85cef23.

`config_file_userdata` and `string_list` were being compiled twice. Credit goes to @bparker06 for finding this.

Fixes #305

* Update libretro-common

* stub the audio

* Fix conversation

* Update

* Compile

* Fix defines

* Init

* Update

* Update libretro-common

* Add initial conver

* deps: Update libretro-common

* Add debugging

* debugging

* Update libretro-common

* debug

* Add more initializing of libretro-audio

* Update audio

* Update audio

* Add love.filesystem.readBuffer()

* Remove unneedded header

* Fix SD

* Clean up vars

* Update

* Use hard coded array size

* Update audio

* Add cppcodec
* Add love.data.encode(base64)
* Add love.data.encode(hex)

* Update libretro-common
* Ignore dirty
* Add branch to .gitmodules
* Update submodules
* Update ChaiScript
* Remove physfs
* Update PhysFS
* Ignore dirty for physfs
* Update CHANGELOG.md
* PhysFS Apple updates
* Add .m file manually
* Fix .o file name
* PhysFS workaround
* Revert PhysFS update
* Use Foundation
* Don't copy .m file
* Add SOURCES_M only on Linux

### Chores
- Switched to [libretro-deps](https://github.com/libretro/libretro-deps) for freetype and zlib
- Clean up of image and audio memory allocation
- Updated documentation

### Features
- `love.system.execute()` to execute a operating system shell command
- `love.audio.newSource()` now has an optional `type` parameter
- `love.joystick` comes with a cleaner API
- `exit()` callback, which is called when is quitting the game
- `love.filesystem` now mounts `libretro/assets`, `libretro/system` and `libretro/saves`

This required some tweaks to the common makefile