Clarify version for check_header, fixes
check_header method was added in compiler object in version 0.47. Documentation needs to be updated for this.
@@ -1644,7 +1644,7 @@ the following methods:
`args` keyword, you can specify external dependencies to use with
`dependencies` keyword argument.
-- `check_header` returns true if the specified header is *usable* with
+- `check_header` *(added 0.47.0)* returns true if the specified header is *usable* with
the specified prefix, dependencies, and arguments.
You can specify external dependencies to use with `dependencies`
keyword argument and extra code to put above the header test with
