put in Cg defaults for unix platforms

dtool/Config.pp

@@ -288,15 +288,21 @@
 #defer HAVE_NURBSPP $[libtest $[NURBSPP_LPATH],$[NURBSPP_LIBS]]
 
 // Is Cg installed, and where?
-#define CG_IPATH /c/Progra~1/Micros~1.NET/Vc7/include
-#define CG_LPATH /c/Progra~1/Micros~1.NET/Vc7/lib
-#define CG_LIBS cg.lib
+#if $[WINDOWS_PLATFORM]
+  #define CG_IPATH /c/Progra~1/Micros~1.NET/Vc7/include
+  #define CG_LPATH /c/Progra~1/Micros~1.NET/Vc7/lib
+  #define CG_LIBS cg.lib
+#else
+  #define CG_IPATH
+  #define CG_LPATH
+  #define CG_LIBS Cg
+#endif
 #defer HAVE_CG $[libtest $[CG_LPATH],$[CG_LIBS]]
 
 // Is CgGL installed, and where?
 #define CGGL_IPATH $[CG_IPATH]
 #define CGGL_LPATH $[CG_LPATH]
-#define CGGL_LIBS cgGL.lib
+#define CGGL_LIBS $[if $[WINDOWS_PLATFORM],cgGL.lib,CgGL]
 #defer HAVE_CGGL $[and $[HAVE_CG],$[libtest $[CGGL_LPATH],$[CGGL_LIBS]]]
 
 // Is VRPN installed, and where?