compat: Provide libprotobuf-cpp vendorcompat prebuilts from v29 VNDK

Android moved to a versioned approach in R and vendorcompat libs were
still possible to build, but not anymore with the Android U release.

Change-Id: Ibe06bf8d22ab0ce24ac5d5d9f3394b8593ee46cb

Android.bp

@@ -422,3 +422,41 @@ cc_library_shared {
     compile_multilib: "64",
     vendor: true,
 }
+
+cc_prebuilt_library_shared {
+    name: "libprotobuf-cpp-full-vendorcompat",
+    stem: "libprotobuf-cpp-full",
+    vendor: true,
+    strip: {
+        none: true,
+    },
+    target: {
+        android_arm: {
+            srcs: ["vndk/v29/arm/libprotobuf-cpp-full.so"],
+        },
+        android_arm64: {
+            srcs: ["vndk/v29/arm64/libprotobuf-cpp-full.so"],
+        },
+    },
+    compile_multilib: "both",
+    check_elf_files: false,
+}
+
+cc_prebuilt_library_shared {
+    name: "libprotobuf-cpp-lite-vendorcompat",
+    stem: "libprotobuf-cpp-lite",
+    vendor: true,
+    strip: {
+        none: true,
+    },
+    target: {
+        android_arm: {
+            srcs: ["vndk/v29/arm/libprotobuf-cpp-lite.so"],
+        },
+        android_arm64: {
+            srcs: ["vndk/v29/arm64/libprotobuf-cpp-lite.so"],
+        },
+    },
+    compile_multilib: "both",
+    check_elf_files: false,
+}

vndk/v29/arm/libprotobuf-cpp-full.so

@@ -0,0 +1 @@
+../../../../../../prebuilts/vndk/v29/arm64/arch-arm-armv8-a/shared/vndk-core/libprotobuf-cpp-full.so

vndk/v29/arm/libprotobuf-cpp-lite.so

@@ -0,0 +1 @@
+../../../../../../prebuilts/vndk/v29/arm64/arch-arm-armv8-a/shared/vndk-core/libprotobuf-cpp-lite.so

vndk/v29/arm64/libprotobuf-cpp-full.so

@@ -0,0 +1 @@
+../../../../../../prebuilts/vndk/v29/arm64/arch-arm64-armv8-a/shared/vndk-core/libprotobuf-cpp-full.so

vndk/v29/arm64/libprotobuf-cpp-lite.so

@@ -0,0 +1 @@
+../../../../../../prebuilts/vndk/v29/arm64/arch-arm64-armv8-a/shared/vndk-core/libprotobuf-cpp-lite.so