Fix a sporadic build breakage.

The issue here is that the makefile sets LOCAL_LDFLAGS
and asks for -llog without declaring a dependency on it.
This will cause build breakages if liblog hasn't already
been built yet.

Change-Id: Ia38761cda44a38b6c2a88902d6108cbe64a328ce
diff --git a/libziparchive/Android.mk b/libziparchive/Android.mk
index 5d836a1..e754c3b 100644
--- a/libziparchive/Android.mk
+++ b/libziparchive/Android.mk
@@ -49,7 +49,7 @@
     -DGTEST_OS_LINUX_ANDROID \
     -DGTEST_HAS_STD_STRING
 LOCAL_SRC_FILES := zip_archive_test.cc
-LOCAL_LDFLAGS := -llog
+LOCAL_SHARED_LIBRARIES := liblog
 LOCAL_STATIC_LIBRARIES := libziparchive libz libgtest libgtest_main libutils
 include $(BUILD_NATIVE_TEST)