Reorder overflow checks

Author: mborland

test/test_erf.cpp

@@ -16,6 +16,7 @@
 #  pragma GCC diagnostic ignored "-Wliteral-range"
 #endif
 
+#define BOOST_MATH_OVERFLOW_ERROR_POLICY ignore_error
 #include <boost/math/special_functions/erf.hpp>
 #include "test_erf.hpp"
 

test/test_gamma.cpp

@@ -7,6 +7,7 @@
 #include <pch_light.hpp>
 #endif
 
+#define BOOST_MATH_OVERFLOW_ERROR_POLICY ignore_error
 #include <boost/math/special_functions/gamma.hpp>
 #include "test_gamma.hpp"
 

test/test_gamma.hpp

@@ -4,8 +4,6 @@
 //  Boost Software License, Version 1.0. (See accompanying file
 //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
-#define BOOST_MATH_OVERFLOW_ERROR_POLICY ignore_error
-
 #include <boost/math/tools/config.hpp>
 #include <boost/math/concepts/real_concept.hpp>
 #include <boost/math/special_functions/math_fwd.hpp>