Include ldd in /system/bin.

Test: `which ldd`
Change-Id: I68a2e5402a82f22e7b715ab3d8ac2c09296b4376
diff --git a/shell_and_utilities/Android.bp b/shell_and_utilities/Android.bp
index bac3dc3..694b50e 100644
--- a/shell_and_utilities/Android.bp
+++ b/shell_and_utilities/Android.bp
@@ -13,6 +13,7 @@
         "auditctl",
         "awk",
         "bzip2",
+        "ldd",
         "logwrapper",
         "mini-keyctl",
         "mkshrc",