Fixed VS2008 build.

scripts/toolchain.lua

@@ -361,7 +361,7 @@ function toolchain(_buildDir, _libDir)
 		}
 
 	configuration { "vs2008" }
-		includedirs { path.join(bxDir .. "include/compat/msvc/pre1600") }
+		includedirs { path.join(bxDir, "include/compat/msvc/pre1600") }
 
 	configuration { "x32", "vs*" }
 		targetdir (path.join(_buildDir, "win32_" .. _ACTION, "bin"))