Remove libunwind-ptrace dependency.

Change-Id: I2bc07526df79bcbda57b850d077350859afe92f8
diff --git a/Android.mk b/Android.mk
index b5857d8..35625c2 100644
--- a/Android.mk
+++ b/Android.mk
@@ -174,7 +174,6 @@
     libcutils \
     libselinux \
     libunwind \
-    libunwind-ptrace \
 
 LOCAL_MODULE := ltrace