Replace BOOST_SYSTEM_NO_DEPRECATED with BOOST_SYSTEM_ENABLE_DEPRECATED

include/boost/system/detail/error_code.ipp

@@ -452,7 +452,7 @@ namespace
 } // unnamed namespace
 
 
-# ifndef BOOST_SYSTEM_NO_DEPRECATED
+# ifdef BOOST_SYSTEM_ENABLE_DEPRECATED
     BOOST_SYSTEM_DECL error_code throws; // "throw on error" special error_code;
                                          //  note that it doesn't matter if this
                                          //  isn't initialized before use since

include/boost/system/error_code.hpp

@@ -144,7 +144,7 @@ namespace boost
 
     } // namespace errc
 
-# ifndef BOOST_SYSTEM_NO_DEPRECATED
+# ifdef BOOST_SYSTEM_ENABLE_DEPRECATED
     namespace posix = errc;
     namespace posix_error = errc;
 # endif
@@ -198,7 +198,7 @@ namespace boost
 #endif
     //  deprecated synonyms ------------------------------------------------------------//
 
-#ifndef BOOST_SYSTEM_NO_DEPRECATED
+#ifdef BOOST_SYSTEM_ENABLE_DEPRECATED
     inline const error_category &  get_system_category() { return system_category(); }
     inline const error_category &  get_generic_category() { return generic_category(); }
     inline const error_category &  get_posix_category() { return generic_category(); }
@@ -533,7 +533,7 @@ namespace boost
     };
 
     //  predefined error_code object used as "throw on error" tag
-# ifndef BOOST_SYSTEM_NO_DEPRECATED
+# ifdef BOOST_SYSTEM_ENABLE_DEPRECATED
     BOOST_SYSTEM_DECL extern error_code throws;
 # endif
 

include/boost/system/linux_error.hpp

@@ -89,7 +89,7 @@ namespace boost
       };
     }  // namespace linux_error
 
-# ifndef BOOST_SYSTEM_NO_DEPRECATED
+# ifdef BOOST_SYSTEM_ENABLE_DEPRECATED
     namespace Linux = linux_error;
 # endif
 

include/boost/system/windows_error.hpp

@@ -107,7 +107,7 @@ namespace boost
 
     }  // namespace windows
 
-# ifndef BOOST_SYSTEM_NO_DEPRECATED
+# ifdef BOOST_SYSTEM_ENABLE_DEPRECATED
     namespace windows = windows_error;
 # endif