change build system to CMake and use SDL3 for everything

libs/SDL3/android-project/build.gradle

@@ -0,0 +1,25 @@
+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+
+buildscript {
+    repositories {
+        mavenCentral()
+        google()
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:8.7.3'
+
+        // NOTE: Do not place your application dependencies here; they belong
+        // in the individual module build.gradle files
+    }
+}
+
+allprojects {
+    repositories {
+        mavenCentral()
+        google()
+    }
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}