When deciding what options compiler accepts, use the version number the

compiler has reported, as opposed to the version number specified by the
user in user-config.jam.


[SVN r51326]

tools/build

@@ -1 +1 @@
-Subproject commit 79234159d1b166cf6a86e7ca604218fef1141650
+Subproject commit 2dd7e1e4ae439dd83bf7a45414f02a959a95e7af