define HAVE_MEMORY_PRIORITY on win32, conf default target to win8.

Author: evoskuil

builds/msvc/vs2022/libbitcoin-system.import.props

@@ -49,7 +49,7 @@
       <!-- WITH_ICU always defined in Visual Studio builds. -->
       <!-- NOMINMAX enables use of std::min/max without conflict. -->
       <!-- WIN32_LEAN_AND_MEAN avoids inclusion of certain headers, winsock.h conflicts with boost and protocol use of winsock2.h. -->
-      <PreprocessorDefinitions>WITH_ICU;WIN32_LEAN_AND_MEAN;NOMINMAX;_WIN32_WINNT=0x0600;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>WITH_ICU;WIN32_LEAN_AND_MEAN;NOMINMAX;_WIN32_WINNT=0x0602;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <!-- Disable auto-linking for all boost-json and its dependency boost-container so they can be header only. -->
       <PreprocessorDefinitions>BOOST_JSON_NO_LIB;BOOST_CONTAINER_NO_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <PreprocessorDefinitions Condition="'$(Linkage-libbitcoin-system)' == 'static' Or '$(Linkage-libbitcoin-system)' == 'ltcg'">BC_STATIC;%(PreprocessorDefinitions)</PreprocessorDefinitions>

include/bitcoin/system/preprocessor.hpp

@@ -194,6 +194,10 @@
     #define _ARM_USE_NEW_NEON_INTRINSICS
 #endif
 
+#if defined(HAVE_MSC) && (_WIN32_WINNT >= 0x0602)
+    #define HAVE_MEMORY_PRIORITY
+#endif
+
 /// Workarounds for C++ noncompliance.
 /// ---------------------------------------------------------------------------
 

src/define.cpp

@@ -203,6 +203,10 @@ DEFINED("HAVE_CPP17")
 DEFINED("HAVE_CPP20")
 #endif
 
+#ifdef HAVE_MEMORY_PRIORITY
+DEFINED("HAVE_MEMORY_PRIORITY")
+#endif
+
 #ifdef HAVE_CONSTEVAL
 DEFINED("HAVE_CONSTEVAL")
 #endif