Remove unnecessary includes from implicit_cast_fail.cpp.

test/implicit_cast_fail.cpp

@@ -4,10 +4,6 @@
 // http://www.boost.org/LICENSE_1_0.txt)
 
 #include <boost/implicit_cast.hpp>
-#include <boost/type.hpp>
-
-#define BOOST_INCLUDE_MAIN
-#include <boost/test/test_tools.hpp>
 
 using boost::implicit_cast;
 
@@ -16,11 +12,9 @@ struct foo
     explicit foo(char const*) {}
 };
 
-int test_main(int, char*[])
+int main()
 {
     foo x = implicit_cast<foo>("foobar");
     (void)x;            // warning suppression.
-    BOOST_CHECK(false); // suppressing warning about 'boost::unit_test::{anonymous}::unit_test_log' defined but not used
     return 0;
 }
-