[android] Replace Oboe audio with SDL3 audio (#4338)

Supersedes #4335.

Replaces the Oboe audio backend with SDL3, since we already support it.
A few caveats:

- SDL defines a JVM OnLoad method already, so we have to instead hijack
  NativeLibrary for id_cache initialization
- This also means some internal fields in Double/Integer/Boolean (namely
  `value`) can't be accessed, so I switched those to methods for now.
- SDL Java sources are pulled in from the CI package.
- Since we can't use SDLActivity, `SDL.setupJNI()` handles everything

Signed-off-by: crueter <crueter@eden-emu.dev>

- [x] I have read and followed the [Contribution Guidelines](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/CONTRIBUTING.md#code-contributions).
- [x] I have read and followed the [AI Policy](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/docs/policies/AI.md)
- [x] I have read and followed the [Coding Guidelines](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/docs/policies/Coding.md) to the best of my ability.

-------------------

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4338
Reviewed-by: Lizzie and Samuel <lizzie@eden-emu.dev>
Reviewed-by: MaranBr <maranbr@eden-emu.dev>

externals/CMakeLists.txt

@@ -136,48 +136,49 @@ if(ENABLE_CUBEB)
     endif()
 endif()
 
-if (NOT ANDROID)
-    if (NOT YUZU_USE_BUNDLED_SDL3)
-        if (NOT WIN32)
-            # Yuzu itself needs: Atomic Audio Events Joystick Haptic Sensor Threads Timers
-            # Since 2.0.18 Atomic+Threads required for HIDAPI/libusb (see https://github.com/libsdl-org/SDL/issues/5095)
-            # Yuzu-cmd also needs: Video (depends on Loadso/Dlopen)
-            # CPUinfo also required for SDL Audio, at least until 2.28.0 (see https://github.com/libsdl-org/SDL/issues/7809)
-            set(SDL_UNUSED_SUBSYSTEMS
-                File Filesystem
-                Locale Power Render)
-            foreach(_SUB ${SDL_UNUSED_SUBSYSTEMS})
-              string(TOUPPER ${_SUB} _OPT)
-              set(SDL_${_OPT} OFF)
-            endforeach()
+if (NOT YUZU_USE_BUNDLED_SDL3)
+    if (NOT WIN32)
+        # Yuzu itself needs: Atomic Audio Events Joystick Haptic Sensor Threads Timers
+        # Since 2.0.18 Atomic+Threads required for HIDAPI/libusb (see https://github.com/libsdl-org/SDL/issues/5095)
+        # Yuzu-cmd also needs: Video (depends on Loadso/Dlopen)
+        # CPUinfo also required for SDL Audio, at least until 2.28.0 (see https://github.com/libsdl-org/SDL/issues/7809)
+        set(SDL_UNUSED_SUBSYSTEMS
+            File Filesystem
+            Locale Power Render)
+        foreach(_SUB ${SDL_UNUSED_SUBSYSTEMS})
+          string(TOUPPER ${_SUB} _OPT)
+          set(SDL_${_OPT} OFF)
+        endforeach()
 
-            set(HIDAPI ON)
-        endif()
-
-        if (APPLE)
-            set(SDL_FILE ON)
-        endif()
-
-        AddJsonPackage(sdl3)
-    else()
-        message(STATUS "Using bundled SDL3")
-        AddJsonPackage(sdl3-ci)
+        set(HIDAPI ON)
     endif()
 
-    # Normalize SDL3 link target across package variants.
-    # Some SDL3 packages export only SDL3::SDL3-shared or SDL3::SDL3-static.
-    if (NOT TARGET SDL3::SDL3)
-        if (TARGET SDL3::SDL3-shared)
-            add_library(SDL3::SDL3 ALIAS SDL3::SDL3-shared)
-        elseif (TARGET SDL3::SDL3-static)
-            add_library(SDL3::SDL3 ALIAS SDL3::SDL3-static)
-        else()
-            message(FATAL_ERROR "SDL3 package found, but no usable SDL3 target was exported")
-        endif()
+    if (APPLE)
+        set(SDL_FILE ON)
+    endif()
+
+    AddJsonPackage(sdl3)
+else()
+    message(STATUS "Using bundled SDL3")
+    AddJsonPackage(sdl3-ci)
+
+    # copy sdl java sources for consumption by Gradle
+    if (ANDROID)
+        file(COPY ${SDL3_SOURCE_DIR}/java DESTINATION ${CMAKE_CURRENT_SOURCE_DIR}/generated/sdl)
     endif()
 endif()
 
-set(BUILD_SHARED_LIBS OFF)
+# Normalize SDL3 link target across package variants.
+# Some SDL3 packages export only SDL3::SDL3-shared or SDL3::SDL3-static.
+if (NOT TARGET SDL3::SDL3)
+    if (TARGET SDL3::SDL3-shared)
+        add_library(SDL3::SDL3 ALIAS SDL3::SDL3-shared)
+    elseif (TARGET SDL3::SDL3-static)
+        add_library(SDL3::SDL3 ALIAS SDL3::SDL3-static)
+    else()
+        message(FATAL_ERROR "SDL3 package found, but no usable SDL3 target was exported")
+    endif()
+endif()
 
 # SPIRV Headers
 AddJsonPackage(spirv-headers)
@@ -385,13 +386,6 @@ if (YUZU_CRASH_DUMPS AND NOT TARGET libbreakpad_client)
     endif()
 endif()
 
-# oboe
-if (ANDROID)
-    AddJsonPackage(oboe)
-
-    add_library(oboe::oboe ALIAS oboe)
-endif()
-
 if (APPLE)
     # moltenvk
     if (NOT YUZU_USE_BUNDLED_MOLTENVK)