update NDK (#981)

* update NDK

* Add ANDROID_NDK_ROOT environment variable

.github/workflows/build.yml

@@ -227,7 +227,7 @@ jobs:
         include:
           - os: ubuntu-24.04
             platform: 33
-            ndk: 27.3.13750724
+            ndk: 29.0.14206865
     steps:
       - uses: actions/checkout@v6
         with:

android-project/app/build.gradle.kts

@@ -24,7 +24,7 @@ android {
         }
     }
 
-    ndkVersion = "27.3.13750724"
+    ndkVersion = "29.0.14206865"
 
     defaultConfig {
         applicationId = "io.github.gopher64.gopher64"
@@ -100,6 +100,7 @@ val ndkBuild = tasks.register<Exec>("ndkBuild") {
     var minSdk = android.defaultConfig.minSdk
     var ndkDir = androidComponents.sdkComponents.ndkDirectory.get().asFile.absolutePath
     environment("ANDROID_NDK_HOME", "$ndkDir")
+    environment("ANDROID_NDK_ROOT", "$ndkDir")
     environment("LIBCLANG_PATH", "$ndkDir/toolchains/llvm/prebuilt/linux-x86_64/musl/lib")
 
     val jniType = if (isRelease) "release" else "debug"