fontconfig: split into multiple outputs

Fixed all 'fontconfig}' references as well, hopefully, ugh!

pkgs/tools/system/plan9port/builder.sh

@@ -5,7 +5,7 @@ export PLAN9_TARGET=$PLAN9
 
 configurePhase()
 {
-    echo CFLAGS=\"-I${fontconfig}/include -I${libXt_dev}/include\" > LOCAL.config
+    echo CFLAGS=\"-I${fontconfig_dev}/include -I${libXt_dev}/include\" > LOCAL.config
     echo X11=\"${libXt_dev}/include\" >> LOCAL.config
 
     for f in `grep -l -r /usr/local/plan9`; do

pkgs/tools/system/plan9port/default.nix

@@ -48,5 +48,5 @@ stdenv.mkDerivation rec {
   };
 
   libXt_dev = libXt.dev;
-  inherit fontconfig;
+  fontconfig_dev = fontconfig.dev;
 }