* Remove trivial builders.

* Make builders unexecutable by removing the hash-bang line and
  execute permission.
* Convert calls to `derivation' to `mkDerivation'.
* Remove `system' and `stdenv' attributes from calls to
  `mkDerivation'.  These transformations were all done automatically,
  so it is quite possible I broke stuff.
* Put the `mkDerivation' function in stdenv/generic.

svn path=/nixpkgs/trunk/; revision=874

pkgs/build-support/fetchsvn/default.nix

@@ -1,8 +1,6 @@
-{stdenv, subversion}: {url, rev}: derivation {
+{stdenv, subversion}: {url, rev}: stdenv.mkDerivation {
   name = "svn-checkout";
-  system = stdenv.system;
   builder = ./builder.sh;
-  stdenv = stdenv;
   subversion = subversion;
   url = url;
   rev = rev;