add IPV6_HDRINCL socket option from linux v4.5
tree2988d2470f86060a88867aca7af5dd6093e2b789
-rw-r--r-- 107 .gitignore
-rw-r--r-- 5714 COPYRIGHT
-rw-r--r-- 6194 INSTALL
-rw-r--r-- 7479 Makefile
-rw-r--r-- 1028 README
-rw-r--r-- 7 VERSION
-rw-r--r-- 62739 WHATSNEW
drwxr-xr-x - arch
-rwxr-xr-x 22681 configure
drwxr-xr-x - crt
drwxr-xr-x - dist
drwxr-xr-x - include
drwxr-xr-x - ldso
drwxr-xr-x - src
drwxr-xr-x - tools