Tidy up gradle scripts

demo/android-gles/app/build.gradle

@@ -5,17 +5,16 @@ def minPlatformVersion = 24       // openGLES 3.2 min api level
 // def minPlatformVersion = 12    // openGLES 2 min api level
 
 android {
-    compileSdkVersion 32
+    compileSdkVersion 34
     ndkVersion '22.1.7171670'
 
     defaultConfig {
         applicationId 'graphics.pathfinder.gles'
         minSdkVersion "${minPlatformVersion}"
-        targetSdkVersion 32
+        targetSdkVersion 34
         externalNativeBuild {
             cmake {
-                arguments '-DANDROID_STL=c++_static'
-                arguments "-DCMAKE_BUILD_TYPE=Release" // Optional.
+                arguments '-DANDROID_STL=c++_static', "-DCMAKE_BUILD_TYPE=Release"
             }
         }
     }

demo/android-vulkan/app/build.gradle

@@ -1,13 +1,13 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 33
+    compileSdkVersion 34
     ndkVersion "23.1.7779620"
 
     defaultConfig {
         applicationId "graphics.pathfinder.vulkan"
         minSdkVersion 24
-        targetSdkVersion 33
+        targetSdkVersion 34
 
         // Shader compilation directives, put glsl shaders to app/src/main/shaders.
         // Android Studio will pick them up and compile them into APK/assets/shaders.
@@ -19,7 +19,7 @@ android {
         externalNativeBuild {
             cmake {
                 abiFilters 'armeabi-v7a', 'arm64-v8a', 'x86', 'x86_64'
-                arguments '-DANDROID_TOOLCHAIN=clang', '-DANDROID_STL=c++_static'
+                arguments '-DANDROID_TOOLCHAIN=clang', '-DANDROID_STL=c++_static', "-DCMAKE_BUILD_TYPE=Release"
             }
         }
     }

demo/android-vulkan/build.gradle

@@ -20,6 +20,6 @@ allprojects {
     }
 }
 
-task clean(type: Delete) {
+tasks.register('clean', Delete) {
     delete rootProject.buildDir
 }