build: define NOMINMAX unconditionally on Windows.

win32/Lol.Core.Rules.props

@@ -12,6 +12,7 @@
       <AdditionalIncludeDirectories>$(SolutionDir)\..\src;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <AdditionalIncludeDirectories Condition="'$(Platform)'=='Win32'">$(GlIncludes);$(SdlIncludes);$(D3d9Includes);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <AdditionalIncludeDirectories Condition="'$(Platform)'=='x64'">$(GlIncludes);$(SdlIncludes);$(D3d9Includes);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>NOMINMAX;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <PreprocessorDefinitions Condition="'$(Platform)'=='Win32'">WIN32;$(Win32Defines);%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <PreprocessorDefinitions Condition="'$(Platform)'=='x64'">WIN32;$(Win32Defines);%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <PreprocessorDefinitions Condition="'$(Platform)'=='Xbox 360'">_XBOX;$(XboxDefines);%(PreprocessorDefinitions)</PreprocessorDefinitions>