Move dead submodules in-tree

Signed-off-by: swurl <swurl@swurl.xyz>

externals/oboe/samples/hello-oboe/build.gradle

@@ -0,0 +1,46 @@
+apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android'
+
+android {
+    compileSdkVersion 35
+    defaultConfig {
+        applicationId 'com.google.oboe.samples.hellooboe'
+        minSdkVersion 21
+        targetSdkVersion 35
+        compileSdkVersion 35
+        versionCode 1
+        versionName '1.0'
+        externalNativeBuild {
+            cmake {
+                cppFlags "-std=c++17"
+                arguments '-DANDROID_STL=c++_static'
+                // armeabi and mips are deprecated in NDK r16 so we don't want to build for them
+                abiFilters 'armeabi-v7a', 'arm64-v8a', 'x86', 'x86_64'
+            }
+        }
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'),
+                          'proguard-rules.pro'
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_18
+        targetCompatibility JavaVersion.VERSION_18
+    }
+    externalNativeBuild {
+        cmake {
+            path 'src/main/cpp/CMakeLists.txt'
+        }
+    }
+    namespace 'com.google.oboe.samples.hellooboe'
+}
+
+dependencies {
+    implementation fileTree(include: ['*.jar'], dir: 'libs')
+    implementation project(':audio-device')
+    implementation 'androidx.appcompat:appcompat:1.7.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.2.1'
+}