manifest: sync libnfnetlink and libnetfilter_conntrack

Change-Id: I0281b7d0f62e53c997d53f83a4d32c644325e11d
diff --git a/remove.xml b/remove.xml
index f682180..a646359 100644
--- a/remove.xml
+++ b/remove.xml
@@ -62,8 +62,6 @@
   <!--<remove-project name="platform/external/e2fsprogs" />-->
   <remove-project name="platform/external/chromium-webview" />
   <remove-project name="platform/external/f2fs-tools" />
-  <remove-project name="platform/external/libnfnetlink" />
-  <remove-project name="platform/external/libnetfilter_conntrack" />
   <!--<remove-project name="platform/external/mksh" /> -->
   <!--<remove-project name="platform/external/tinycompress" /> -->
   <remove-project name="platform/external/selinux" />