Add support for ECDSA P-256 with SHA256

This adds a small EC library that is capable of verifying a signature of
SHA256 with ECDSA on the NIST P-256 curve.

Change-Id: I2a16639c92a77e8e4783c47ffbc56676de56eb59
diff --git a/libmincrypt/test/Android.mk b/libmincrypt/test/Android.mk
index a28ccd8..73ff7d0 100644
--- a/libmincrypt/test/Android.mk
+++ b/libmincrypt/test/Android.mk
@@ -1,10 +1,15 @@
 # Copyright 2013 The Android Open Source Project
 
 LOCAL_PATH := $(call my-dir)
-include $(CLEAR_VARS)
 
+include $(CLEAR_VARS)
 LOCAL_MODULE := rsa_test
 LOCAL_SRC_FILES := rsa_test.c
 LOCAL_STATIC_LIBRARIES := libmincrypt
-include $(BUILD_HOST_EXECUTABLE)
+include $(BUILD_HOST_NATIVE_TEST)
 
+include $(CLEAR_VARS)
+LOCAL_MODULE := ecdsa_test
+LOCAL_SRC_FILES := ecdsa_test.c
+LOCAL_STATIC_LIBRARIES := libmincrypt
+include $(BUILD_HOST_NATIVE_TEST)