fix/android-debug-inference-issue: Applied BUILD_TYPE=Release to NDK build of whisper.android example

Author: yymin1022

examples/whisper.android/app/build.gradle

@@ -22,12 +22,25 @@ android {
     }
 
     buildTypes {
+        debug {
+            externalNativeBuild {
+                cmake {
+                    // When the AGP build type is Debug, the native (NDK/CMake) build does not run
+                    // compiler optimizations by default, causing a critical performance issue.
+                    // We force CMAKE_BUILD_TYPE to Release here so native code stays optimized
+                    // even in Debug AGP builds.
+                    arguments "-DCMAKE_BUILD_TYPE=Release"
+                }
+            }
+        }
+
         release {
             signingConfig signingConfigs.debug
             minifyEnabled true
             proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
         }
     }
+
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_17
         targetCompatibility JavaVersion.VERSION_17