Add hardening patch.
treeea40933583eb2246627b5d95d0fe8af0f6b27283
-rw-r--r-- 456 .gitignore
-rw-r--r-- 210 Makefile
-rw-r--r-- 1468 README
drwxr-xr-x - contrib
drwxr-xr-x - debian
drwxr-xr-x - lwip