Enable BuildConfig through buildFeatures, not gradle.properties.

app/build.gradle.kts

@@ -163,6 +163,7 @@ android {
   }
 
   buildFeatures {
+    buildConfig = true
     viewBinding = true
     compose = true
   }

build-logic/plugins/src/main/java/signal-sample-app.gradle.kts

@@ -46,6 +46,7 @@ android {
   }
 
   buildFeatures {
+    buildConfig = true
     compose = true
   }
 

donations/lib/build.gradle.kts

@@ -5,6 +5,10 @@ plugins {
 
 android {
   namespace = "org.signal.donations"
+
+  buildFeatures {
+    buildConfig = true
+  }
 }
 
 dependencies {

gradle.properties

@@ -1,7 +1,6 @@
 org.gradle.jvmargs=-Xmx6g -Xms256m -XX:MaxMetaspaceSize=1g
 android.useAndroidX=true
 android.experimental.androidTest.numManagedDeviceShards=4
-android.defaults.buildfeatures.buildconfig=true
 android.nonTransitiveRClass=false
 android.nonFinalResIds=false