avoid Net-Ping tests during building perl-5.16.3
ncurses: add --enable-symlinks in configure flag since afs hardlink problem beyond directory boundary.
ref: http://lists.bestpractical.com/pipermail/shipwright/2010-June/000029.html
enable-symlink-install for e2fsprogs (needed for installation on afs)
Merge branch 'perl-no-ping' of github.com:wavewave/nixpkgs into perl-no-ping