Fix building of updater for 4.2 environment

Change-Id: I2dc6690f77f4fbaca0ab0ff849b8b07875129827
diff --git a/updater/Android.mk b/updater/Android.mk
index 8f20b33..89f4b99 100644
--- a/updater/Android.mk
+++ b/updater/Android.mk
@@ -24,6 +24,12 @@
 LOCAL_STATIC_LIBRARIES += \
     libext4_utils \
     libz
+ifneq ($(wildcard system/core/libmincrypt/rsa_e_3.c),)
+LOCAL_STATIC_LIBRARIES = \
+    libext4_utils_static \
+    libsparse_static \
+    libz
+endif
 endif
 
 ifeq ($(HAVE_SELINUX), true)