Do not pass "-pie" in cflags

Bug: http://b/111000555

It's only needed for linking and Android already passes this by default.
Passing it to a compile step causes clang to emit
-Wunused-command-line-argument.

Test: build
Change-Id: Iea608387a57f0a65cfc3e67ab19c8d812f4aef37
diff --git a/test/Android.bp b/test/Android.bp
index 9e34a51..2a5b6c7 100644
--- a/test/Android.bp
+++ b/test/Android.bp
@@ -27,7 +27,6 @@
         "-DARM",
         "-DMD5_DISABLE",
         "-fPIC",
-        "-pie",
         "-Wall",
         "-Werror",
         "-Wno-unused-variable",