adb: really fix the mac build.

Test: changed `#if !defined(__APPLE__)` to `#if 0` and ran mma
Change-Id: I173cccbfb7bad348ac4796a2d6cebb8490f63479
diff --git a/adb/Android.bp b/adb/Android.bp
index 1f41e4f..cfc3503 100644
--- a/adb/Android.bp
+++ b/adb/Android.bp
@@ -96,6 +96,7 @@
     "adb_io.cpp",
     "adb_listeners.cpp",
     "adb_trace.cpp",
+    "adb_unique_fd.cpp",
     "adb_utils.cpp",
     "fdevent.cpp",
     "services.cpp",