xorg.libXt: re-split into multiple outputs

Fixed all 'libXt}' references, too.

pkgs/tools/system/plan9port/builder.sh

@@ -5,8 +5,8 @@ export PLAN9_TARGET=$PLAN9
 
 configurePhase()
 {
-    echo CFLAGS=\"-I${fontconfig}/include -I${libXt}/include\" > LOCAL.config
-    echo X11=\"${libXt}/include\" >> LOCAL.config
+    echo CFLAGS=\"-I${fontconfig}/include -I${libXt_dev}/include\" > LOCAL.config
+    echo X11=\"${libXt_dev}/include\" >> LOCAL.config
 
     for f in `grep -l -r /usr/local/plan9`; do
         sed "s,/usr/local/plan9,${PLAN9},g" -i $f

pkgs/tools/system/plan9port/default.nix

@@ -47,6 +47,6 @@ stdenv.mkDerivation rec {
     platforms = platforms.unix;
   };
 
-  inherit libXt;
+  libXt_dev = libXt.dev;
   inherit fontconfig;
 }