recovery: Add lz4 libs if available

 * Required by transparent compresssion in make_ext4fs.

Change-Id: I566c9e1281cc0dd725e96db32da0a1c3c000030e
diff --git a/Android.mk b/Android.mk
index ddd2c7d..27abb5e 100644
--- a/Android.mk
+++ b/Android.mk
@@ -112,6 +112,9 @@
     LOCAL_CFLAGS += -DUSE_EXT4
     LOCAL_C_INCLUDES += system/extras/ext4_utils
     LOCAL_SHARED_LIBRARIES += libext4_utils
+    ifneq ($(wildcard external/lz4/Android.mk),)
+        LOCAL_STATIC_LIBRARIES += liblz4-static
+    endif
 endif
 ifneq ($(wildcard external/libselinux/Android.mk),)
     TWHAVE_SELINUX := true
@@ -129,6 +132,9 @@
         LOCAL_CFLAGS += -DUSE_EXT4
         LOCAL_C_INCLUDES += system/extras/ext4_utils
         LOCAL_SHARED_LIBRARIES += libext4_utils
+        ifneq ($(wildcard external/lz4/Android.mk),)
+            LOCAL_STATIC_LIBRARIES += liblz4-static
+        endif
     endif
 endif