fifo: Add test for multi-process

Test: this is it
Change-Id: Iea4f6ee9f7ec4e1a2e3d49f0065493796aaeed20
diff --git a/audio_utils/tests/Android.bp b/audio_utils/tests/Android.bp
index 1bda5b8..6fa3f82 100644
--- a/audio_utils/tests/Android.bp
+++ b/audio_utils/tests/Android.bp
@@ -35,6 +35,18 @@
     ],
 }
 
+cc_binary {
+    name: "fifo_multiprocess",
+    host_supported: false,
+    srcs: ["fifo_multiprocess.cpp"],
+    shared_libs: ["libaudioutils", "libcutils"],
+    static_libs: ["libsndfile"],
+    cflags: [
+        "-Werror",
+        "-Wall",
+    ],
+}
+
 cc_binary_host {
     name: "fifo_threads",
     // TODO move getch.c and .h to a utility library