Adding libeatmydata.

It doesn't run very well with our symlinks in PATH, but I don't know what
patch can make it work still. This is better than nothing; calling it
with its full path makes it work.

pkgs/development/libraries/libeatmydata/default.nix

@@ -0,0 +1,16 @@
+{ stdenv, fetchurl }:
+
+stdenv.mkDerivation rec {
+  name = "libeatmydata-65";
+  
+  src = fetchurl {
+    url = "http://www.flamingspork.com/projects/libeatmydata/${name}.tar.gz";
+    sha256 = "1hfmd24ps5661zbbw1qqgqs6hcwx6ll2fxz2j4cfvkmf0kzw25la";
+  };
+
+  meta = {
+    homepage = http://www.flamingspork.com/projects/libeatmydata/;
+    license = "GPLv3+";
+    description = "Small LD_PRELOAD library to disable fsync and friends";
+  };
+}