Remove obsolete MSVC check from pragma guard

git grep -h -B1 "^#\s*pragma once" | grep -v pragma | sort | uniq

is now clean.

[SVN r85952]

include/boost/intrusive/detail/assert.hpp

@@ -13,7 +13,7 @@
 #ifndef BOOST_INTRUSIVE_DETAIL_ASSERT_HPP
 #define BOOST_INTRUSIVE_DETAIL_ASSERT_HPP
 
-#if defined(_MSC_VER)&&(_MSC_VER>=1200)
+#if defined(_MSC_VER)
 #pragma once
 #endif
 

include/boost/intrusive/detail/memory_util.hpp

@@ -17,7 +17,7 @@
 #ifndef BOOST_INTRUSIVE_ALLOCATOR_MEMORY_UTIL_HPP
 #define BOOST_INTRUSIVE_ALLOCATOR_MEMORY_UTIL_HPP
 
-#if (defined _MSC_VER) && (_MSC_VER >= 1200)
+#if defined(_MSC_VER)
 #  pragma once
 #endif
 

include/boost/intrusive/detail/preprocessor.hpp

@@ -11,7 +11,7 @@
 #ifndef BOOST_INTRUSIVE_DETAIL_PREPROCESSOR_HPP
 #define BOOST_INTRUSIVE_DETAIL_PREPROCESSOR_HPP
 
-#if (defined _MSC_VER) && (_MSC_VER >= 1200)
+#if defined(_MSC_VER)
 #  pragma once
 #endif
 

include/boost/intrusive/pointer_traits.hpp

@@ -17,7 +17,7 @@
 #ifndef BOOST_INTRUSIVE_POINTER_TRAITS_HPP
 #define BOOST_INTRUSIVE_POINTER_TRAITS_HPP
 
-#if (defined _MSC_VER) && (_MSC_VER >= 1200)
+#if defined(_MSC_VER)
 #  pragma once
 #endif
 

test/smart_ptr.hpp

@@ -16,7 +16,7 @@
 #include <boost/pointer_cast.hpp>
 #include <boost/intrusive/pointer_traits.hpp>
 
-#if (defined _MSC_VER) && (_MSC_VER >= 1200)
+#if (defined _MSC_VER)
 #  pragma once
 #endif