Use a shared library when building vold

A quick fix to a broken build resulted in using a static library
to build vold when a shared library was available.  This fixes
that.

Bug: 10332978
Change-Id: I31c2b4a87c7b37647e71f7f3c93b0d64dd52da44
diff --git a/Android.mk b/Android.mk
index c7fc0df..8d0b249 100644
--- a/Android.mk
+++ b/Android.mk
@@ -32,13 +32,13 @@
 	libdiskconfig \
 	libhardware_legacy \
 	liblogwrap \
+	libext4_utils \
 	libcrypto
 
 common_static_libraries := \
 	libfs_mgr \
 	libscrypt_static \
-	libmincrypt \
-	libext4_utils_static
+	libmincrypt
 
 include $(CLEAR_VARS)