Turn more licenses into lib.licenses style

Should eval cleanly, as far as -A tarball tells me.

Relevant: issue #2999, issue #739

pkgs/games/eduke32/default.nix

@@ -2,18 +2,18 @@
 
 stdenv.mkDerivation rec {
   name = "eduke32-20130303-3542";
-  
+
   src = fetchurl {
     url = http://dukeworld.duke4.net/eduke32/synthesis/20130303-3542/eduke32_src_20130303-3542.tar.bz2;
     sha256 = "0v1q2bkmpnac5l9x97nnlhrrb95518vmhxx48zv3ncvmpafl1mqc";
   };
-  
+
   buildInputs = [ SDL SDL_mixer libvorbis mesa gtk pkgconfig libvpx flac ]
     ++ stdenv.lib.optional (stdenv.system == "i686-linux") nasm;
-  
+
   NIX_CFLAGS_COMPILE = "-I${SDL}/include/SDL";
   NIX_LDFLAGS = "-L${SDL}/lib -lgcc_s";
-  
+
   desktopItem = makeDesktopItem {
     name = "eduke32";
     exec = "eduke32-wrapper";
@@ -26,7 +26,7 @@ stdenv.mkDerivation rec {
   preConfigure = ''
     sed -i -e "s|/usr/bin/sdl-config|${SDL}/bin/sdl-config|" build/Makefile.shared
   '';
-  
+
   buildPhase = ''
     make OPTLEVEL=0
   '';
@@ -34,34 +34,34 @@ stdenv.mkDerivation rec {
   installPhase = ''
     # Install binaries
     mkdir -p $out/bin
-    cp eduke32 mapster32 $out/bin 
-    
+    cp eduke32 mapster32 $out/bin
+
     # Make wrapper script
     cat > $out/bin/eduke32-wrapper <<EOF
     #!/bin/sh
-    
+
     if [ "$EDUKE32_DATA_DIR" = "" ]
-    then 
+    then
         EDUKE32_DATA_DIR=/var/lib/games/eduke32
     fi
     if [ "$EDUKE32_GRP_FILE" = "" ]
     then
         EDUKE32_GRP_FILE=\$EDUKE32_DATA_DIR/DUKE3D.GRP
     fi
-    
+
     cd \$EDUKE32_DATA_DIR
-    eduke32 -g \$EDUKE32_GRP_FILE    
+    eduke32 -g \$EDUKE32_GRP_FILE
     EOF
     chmod 755 $out/bin/eduke32-wrapper
-    
+
     # Install desktop item
     mkdir -p $out/share/applications
     cp ${desktopItem}/share/applications/* $out/share/applications
   '';
-  
+
   meta = {
     description = "Enhanched port of Duke Nukem 3D for various platforms";
-    license = "GPLv2+ and BUILD license";
+    license = stdenv.lib.licenses.gpl2Plus;
     homepage = http://eduke32.com;
     maintainers = [ stdenv.lib.maintainers.sander ];
   };