Fix warning: BOOST_MSVC is not defined

Change-Id: I99d542af1b0d5ba68cad23512bad275aed83f0fd

boost/boost.wundef.patch

@@ -106,3 +106,14 @@
  #        define BOOST_PP_VARIADIC_SIZE(...) BOOST_PP_CAT(BOOST_PP_VARIADIC_SIZE_I(__VA_ARGS__, 64, 63, 62, 61, 60, 59, 58, 57, 56, 55, 54, 53, 52, 51, 50, 49, 48, 47, 46, 45, 44, 43, 42, 41, 40, 39, 38, 37, 36, 35, 34, 33, 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1,),)
  #    else
  #        define BOOST_PP_VARIADIC_SIZE(...) BOOST_PP_VARIADIC_SIZE_I(__VA_ARGS__, 64, 63, 62, 61, 60, 59, 58, 57, 56, 55, 54, 53, 52, 51, 50, 49, 48, 47, 46, 45, 44, 43, 42, 41, 40, 39, 38, 37, 36, 35, 34, 33, 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1,)
+--- foo/foo/foo/boost/utility/result_of.hpp
++++ foo/foo/foo/boost/utility/result_of.hpp
+@@ -72,7 +72,7 @@
+ // There doesn't seem to be any other way to turn this off such that the presence of
+ // the user-defined operator,() below doesn't cause spurious warning all over the place,
+ // so unconditionally turn it off.
+-#if BOOST_MSVC
++#if defined(BOOST_MSVC) && BOOST_MSVC
+ #  pragma warning(disable: 4913) // user defined binary operator ',' exists but no overload could convert all operands, default built-in binary operator ',' used
+ #endif
+