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
 
diff --git a/updater/Android.mk b/updater/Android.mk
index 0045d6f..3fbeef3 100644
--- a/updater/Android.mk
+++ b/updater/Android.mk
@@ -38,6 +38,9 @@
     libsparse_static \
     libz
 endif
+ifneq ($(wildcard external/lz4/Android.mk),)
+    LOCAL_STATIC_LIBRARIES += liblz4-static
+endif
 endif
 
 LOCAL_STATIC_LIBRARIES += $(TARGET_RECOVERY_UPDATER_LIBS) $(TARGET_RECOVERY_UPDATER_EXTRA_LIBS)