simplify automatic project generation

source/detail/linux_X11/platform_spec.cpp

@@ -13,6 +13,9 @@
  *
  *	http://standards.freedesktop.org/clipboards-spec/clipboards-0.1.txt
  */
+
+#if defined(NANA_LINUX) || defined(NANA_MACOS)
+
 #include <nana/detail/platform_spec_selector.hpp>
 #include <X11/Xlocale.h>
 #include <locale>
@@ -1411,3 +1414,7 @@ namespace detail
 	}
 }//end namespace detail
 }//end namespace nana
+
+
+//#if defined(NANA_LINUX) || defined(NANA_MACOS)
+#endif

source/detail/win32/platform_spec.cpp

@@ -11,6 +11,9 @@
  *
  *	This file provides basis class and data structrue that required by nana
  */
+
+#if defined(NANA_WINDOWS)
+
 #include <nana/detail/platform_spec_selector.hpp>
 #include <shellapi.h>
 #include <stdexcept>
@@ -289,3 +292,6 @@ namespace detail
 	}
 }//end namespace detail
 }//end namespace nana
+
+//#if defined(NANA_WINDOWS)
+#endif