VisualC: build release artifacts with /OPT:ICF and /OPT:REF

These were disabled because SDL2_image.dll was created with /DEBUG:FULL.

(cherry picked from commit 54e7bb8)

VisualC/SDL_image.vcxproj

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup Label="ProjectConfigurations">
     <ProjectConfiguration Include="Debug|Win32">
@@ -129,7 +129,6 @@
       <WarningLevel>Level3</WarningLevel>
       <Optimization>Disabled</Optimization>
       <DebugInformationFormat>OldStyle</DebugInformationFormat>
-      <EnableEnhancedInstructionSet>StreamingSIMDExtensions</EnableEnhancedInstructionSet>
     </ClCompile>
     <ResourceCompile>
       <PreprocessorDefinitions>_DEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
@@ -163,6 +162,8 @@
     <Link>
       <AdditionalDependencies>SDL2.lib;%(AdditionalDependencies)</AdditionalDependencies>
       <SubSystem>Windows</SubSystem>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
     </Link>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
@@ -180,14 +181,15 @@
       <PreprocessorDefinitions>DLL_EXPORT;NDEBUG;WIN32;_WINDOWS;USE_STBIMAGE;LOAD_AVIF;LOAD_AVIF_DYNAMIC="libavif-16.dll";LOAD_BMP;LOAD_GIF;LOAD_JPG;LOAD_LBM;LOAD_PCX;LOAD_PNG;LOAD_PNM;LOAD_QOI;LOAD_SVG;LOAD_TGA;LOAD_TIF;LOAD_TIF_DYNAMIC="libtiff-5.dll";LOAD_WEBP;LOAD_WEBP_DYNAMIC="libwebp-7.dll";LOAD_WEBPDEMUX_DYNAMIC="libwebpdemux-2.dll";LOAD_XCF;LOAD_XPM;LOAD_XV;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
       <WarningLevel>Level3</WarningLevel>
-      <EnableEnhancedInstructionSet>StreamingSIMDExtensions</EnableEnhancedInstructionSet>
     </ClCompile>
     <ResourceCompile>
       <PreprocessorDefinitions>NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
     </ResourceCompile>
     <Link>
       <SubSystem>Windows</SubSystem>
       <AdditionalDependencies>SDL2.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
     </Link>
   </ItemDefinitionGroup>
   <ItemGroup>
@@ -213,7 +215,7 @@
     <ClCompile Include="..\src\IMG_xv.c" />
   </ItemGroup>
   <ItemGroup>
-    <ResourceCompile Include="..\src\version.rc" />
+    <ResourceCompile Include="Version.rc" />
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\include\SDL_image.h" />