dep: Add cubeb

dep/cubeb/INSTALL.md

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+# Build instructions for libcubeb
+
+You must have CMake v3.1 or later installed.
+
+1. `git clone --recursive https://github.com/kinetiknz/cubeb.git`
+2. `mkdir cubeb-build`
+3. `cd cubeb-build`
+3. `cmake ../cubeb`
+4. `cmake --build .`
+5. `ctest`
+
+# Windows build notes
+
+Windows builds can use Microsoft Visual Studio 2015, Microsoft Visual Studio
+2017, or MinGW-w64 with Win32 threads (by passing `cmake -G` to generate the
+appropriate build configuration).
+
+## Microsoft Visual Studio 2015 or 2017 Command Line
+
+CMake can be used from the command line by following the build steps at the top
+of this file. CMake will select a default generator based on the environment,
+or one can be specified with the `-G` argument.
+
+## Microsoft Visual Studio 2017 IDE
+
+Visual Studio 2017 adds in built support for CMake. CMake can be used from
+within the IDE via the following steps:
+
+- Navigate to `File -> Open -> Cmake...`
+- Open `CMakeLists.txt` file in the root of the project.
+
+Note, to generate the build in the cubeb dir CMake settings need to be updated
+via: `CMake -> Change CMake Settings -> CMakeLists.txt`. The default
+configuration used by Visual Studio will place the build in a different location
+than the steps detailed at the top of this file.
+
+## MinGW-w64
+
+To build with MinGW-w64, install the following items:
+
+- Download and install MinGW-w64 with Win32 threads.
+- Download and install CMake.
+- Run MinGW-w64 Terminal from the Start Menu.
+- Follow the build steps at the top of this file, but at step 3 run:
+  `cmake -G "MinGW Makefiles" ..`
+- Continue the build steps at the top of this file.