Revert "update wmii. libixp vanished"

The new wmii has some wired behaviour:
- When you move windows the curser location changes.
  Until the window manager has changed that location movement of mouse is
  ignored.
- window do not always popup in the col which was focused.
- wmiimenu broke

old wmii does not build with newer libixp

Until I know how to fix those issues I'll revert my update

This reverts -r 21683

svn path=/nixpkgs/trunk/; revision=21816

pkgs/development/libraries/libixp_for_wmii/default.nix

@@ -7,15 +7,15 @@ stdenv.mkDerivation {
      sed -i -e \"s%^PREFIX.*%PREFIX=\$out%\" \\
             -e \"s%^\\(INCLUDE.*\\)%\\1 \$NIX_CFLAGS_COMPILE%\" \\
             -e \"s%^\\(LIBS.*\\)%\\1 \$LDFLAGS%\" \\
-              config.mk
+            config.mk
      make
      mkdir -p \$out/include
      cp -r include/*.h \$out/include
      cp -r lib \$out
   ";
   src = fetchurl {
-    url = http://dl.suckless.org/libs/libixp-0.5.tar.gz;
-    sha256 = "0jqyw8xzih7x7apdp2s9w8agjry890kf55zj2habsg78cyxz1x35";
+    url = http://dl.suckless.org/libs/libixp-0.4.tar.gz;
+    sha256 = "0b44p9wvmzxpyf2xd86rxyr49bmfh9cd5hj3d234gkvynvgph60p";
   };
 
   meta = {