gel.window: Add support for a Gtk window.

4-high/gel/library/gel.gpr

@@ -3,7 +3,7 @@ with
      "opengl",
      "collada",
      "physics",
-     "sdlada",
+--     "sdlada",
      "lace_shared";
 
 --library
@@ -25,7 +25,7 @@ is
                             "../source/joint", 
                             "../source/applet",
                             "../source/applet/distributed",
-                            "../source/platform/sdl",
+  --                          "../source/platform/sdl",
                             "../source/terrain",
                             "../source/world");
 
@@ -33,8 +33,8 @@ is
    package Builder  renames Lace_shared.Builder;
    package Compiler renames Lace_shared.Compiler;
 
-   package Linker is
-      for Linker_Options use ("-g", "-lSDL2");
-   end Linker;
+--   package Linker is
+--      for Linker_Options use ("-g", "-lSDL2");
+--   end Linker;
 
 end GEL;