pkgs/top-level/all-packages.nix: added ikiwiki.{git,monotone} options to $NIXPKGS_CONFIG

Set "ikiwiki = { git = true; monotone = true; };" in $NIXPKGS_CONFIG to
enable support for git and monotone in ikiwiki. If left unconfigured,
the default is to include support for git, but not for monotone.

svn path=/nixpkgs/trunk/; revision=21415

pkgs/top-level/all-packages.nix

@@ -7653,8 +7653,8 @@ let
     inherit fetchurl stdenv perl gettext makeWrapper lib;
     inherit (perlPackages) TextMarkdown URI HTMLParser HTMLScrubber
       HTMLTemplate TimeDate CGISession DBFile CGIFormBuilder LocaleGettext;
-    inherit git; # The RCS should be optional
-    monotone = null;
+    git = if getPkgConfig "ikiwiki" "git" true then git else null;
+    monotone = if getPkgConfig "ikiwiki" "monotone" false then monotone else null;
     extraUtils = [];
   };