add MADV_FREE madvise command from linux v4.5
treea0ab2b66694ce28c78530b9ae9ef0646ce6f48b1
-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