[APU/Linux] Implement cross platform audio using SDL2 library.

src/xenia/apu/sdl/premake5.lua

@@ -0,0 +1,29 @@
+project_root = "../../../.."
+include(project_root.."/tools/build")
+
+group("src")
+project("xenia-apu-sdl")
+  uuid("153b4e8b-813a-40e6-9366-4b51abc73c45")
+  kind("StaticLib")
+  language("C++")
+  links({
+    "xenia-base",
+    "xenia-apu",
+    "SDL2",
+  })
+  defines({
+  })
+  local_platform_files()
+
+  filter("platforms:Windows")
+    -- On linux we build against the system version (libsdl2-dev)
+    includedirs({
+      project_root.."/third_party/SDL2-devel-VC/include/",
+    })
+    libdirs({
+      project_root.."/third_party/SDL2-devel-VC/lib/x64/",
+    })
+    -- Copy the dll to the output folder
+    postbuildcommands({
+      "{COPY} %{prj.basedir}/"..project_root.."/third_party/SDL2-devel-VC/lib/x64/SDL2.dll %{cfg.targetdir}",
+    })