Enable noexcept qualifier for error categories when using recent versions of boost.

asio/boostify.pl

diff --git a/asio/boostify.pl b/asio/boostify.pl
index e4b6dd0..144b1ca 100755
--- a/asio/boostify.pl
+++ b/asio/boostify.pl
@@ -121,10 +121,6 @@
     {
       $line =~ s/asio_detail_posix_thread_function/boost_asio_detail_posix_thread_function/g;
     }
-    if ($line =~ /const ASIO_ERROR_CATEGORY_NOEXCEPT$/)
-    {
-      $line =~ s/ ASIO_ERROR_CATEGORY_NOEXCEPT$//;
-    }
     if ($line =~ /ASIO_/ && !($line =~ /BOOST_ASIO_/))
     {
       $line =~ s/ASIO_/BOOST_ASIO_/g;

asio/include/asio/detail/config.hpp

diff --git a/asio/include/asio/detail/config.hpp b/asio/include/asio/detail/config.hpp
index c088033..bbd2865 100644
--- a/asio/include/asio/detail/config.hpp
+++ b/asio/include/asio/detail/config.hpp
@@ -114,7 +114,9 @@
 
 // Compliant C++11 compilers put noexcept specifiers on error_category members.
 #if !defined(ASIO_ERROR_CATEGORY_NOEXCEPT)
-# if defined(__GNUC__)
+# if (BOOST_VERSION >= 105300)
+#  define ASIO_ERROR_CATEGORY_NOEXCEPT BOOST_NOEXCEPT
+# elif defined(__GNUC__)
 #  if ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 7)) || (__GNUC__ > 4)
 #   if defined(__GXX_EXPERIMENTAL_CXX0X__)
 #     define ASIO_ERROR_CATEGORY_NOEXCEPT noexcept(true)