Fix OVERRIDE_DEPRECATION warnings in project code

plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/res/AndroidPackageFragmentProviderExtension.kt

@@ -139,6 +139,7 @@ class AndroidSyntheticPackageFragmentProvider(
 
     override fun isEmpty(fqName: FqName): Boolean = !packages.containsKey(fqName)
 
+    @Deprecated("for usages use #packageFragments(FqName) at final point, for impl use #collectPackageFragments(FqName, MutableCollection<PackageFragmentDescriptor>)")
     override fun getPackageFragments(fqName: FqName) = listOfNotNull(packages[fqName]?.invoke())
 
     override fun getSubPackagesOf(fqName: FqName, nameFilter: (Name) -> Boolean): List<FqName> {
@@ -146,4 +147,4 @@ class AndroidSyntheticPackageFragmentProvider(
             .filter { (k, _) -> !k.isRoot && k.parent() == fqName }
             .mapTo(mutableListOf()) { it.key }
     }
-}
+}