Build acc tool with static rather than shared library.

OS X does not allow relative shared library path names in compiled apps,
so we have to create and link with a static library version of libacc.
diff --git a/libacc/Android.mk b/libacc/Android.mk
index 2b4998e..5101e16 100644
--- a/libacc/Android.mk
+++ b/libacc/Android.mk
@@ -11,7 +11,7 @@
 
 include $(BUILD_SHARED_LIBRARY)
 
-# Shared library for host
+# Static library for host
 # ========================================================
 
 include $(CLEAR_VARS)
@@ -23,7 +23,7 @@
 LOCAL_STATIC_LIBRARIES := libcutils
 LOCAL_LDLIBS := -ldl
 
-include $(BUILD_HOST_SHARED_LIBRARY)
+include $(BUILD_HOST_STATIC_LIBRARY)
 
 # Build children
 # ========================================================