Define _WIN32_WINNT in Firebird.Common.props

Author: mrotteveel

builds/win32/msvc15/FirebirdCommon.props

@@ -27,7 +27,7 @@
       <CompileAs>Default</CompileAs>
       <UseFullPaths>false</UseFullPaths>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
-      <PreprocessorDefinitions>_CRT_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>_CRT_SECURE_NO_WARNINGS;_WIN32_WINNT=0x0601;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <TreatSpecificWarningsAsErrors>4715</TreatSpecificWarningsAsErrors>
     </ClCompile>
     <Link>

src/include/gen/autoconfig_msvc.h

@@ -6,8 +6,9 @@
 // use to this version.
 #define FB_WIN32_WINNT_BASELINE 0x0601
 
+// Normally, _WIN32_WINNT is defined in the PreprocessorDefinitions of Firebird.Common.props.
 #ifndef _WIN32_WINNT
-// Set _WIN32_WINNT to the baseline, but allow overriding
+// Fallback to set _WIN32_WINNT to the baseline.
 #define _WIN32_WINNT FB_WIN32_WINNT_BASELINE
 #elif (_WIN32_WINNT < FB_WIN32_WINNT_BASELINE)
 // Consider Windows versions before the baseline really too old.