SDL: visualc: Turn on multiprocessor compilation.

https://github.com/libsdl-org/SDL/commit/d6b4f4848877a060d2dcb39052320dc7b920b240

From d6b4f4848877a060d2dcb39052320dc7b920b240 Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <[EMAIL REDACTED]>
Date: Fri, 14 Jul 2023 19:58:05 -0400
Subject: [PATCH] visualc: Turn on multiprocessor compilation.

---
 VisualC/SDL/SDL.vcxproj           | 6 +++++-
 VisualC/SDL_test/SDL_test.vcxproj | 6 +++++-
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/VisualC/SDL/SDL.vcxproj b/VisualC/SDL/SDL.vcxproj
index 8b8f6d6a79cf..0cea50604261 100644
--- a/VisualC/SDL/SDL.vcxproj
+++ b/VisualC/SDL/SDL.vcxproj
@@ -122,6 +122,7 @@
       <InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
       <PrecompiledHeader>Use</PrecompiledHeader>
       <PrecompiledHeaderFile>SDL_internal.h</PrecompiledHeaderFile>
+      <MultiProcessorCompilation>true</MultiProcessorCompilation>
     </ClCompile>
     <ResourceCompile>
       <PreprocessorDefinitions>_DEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
@@ -153,6 +154,7 @@
       <InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
       <PrecompiledHeader>Use</PrecompiledHeader>
       <PrecompiledHeaderFile>SDL_internal.h</PrecompiledHeaderFile>
+      <MultiProcessorCompilation>true</MultiProcessorCompilation>
     </ClCompile>
     <ResourceCompile>
       <PreprocessorDefinitions>_DEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
@@ -188,6 +190,7 @@
       <InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
       <PrecompiledHeader>Use</PrecompiledHeader>
       <PrecompiledHeaderFile>SDL_internal.h</PrecompiledHeaderFile>
+      <MultiProcessorCompilation>true</MultiProcessorCompilation>
     </ClCompile>
     <ResourceCompile>
       <PreprocessorDefinitions>NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
@@ -220,6 +223,7 @@
       <InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
       <PrecompiledHeader>Use</PrecompiledHeader>
       <PrecompiledHeaderFile>SDL_internal.h</PrecompiledHeaderFile>
+      <MultiProcessorCompilation>true</MultiProcessorCompilation>
     </ClCompile>
     <ResourceCompile>
       <PreprocessorDefinitions>NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
@@ -656,4 +660,4 @@
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>
-</Project>
+</Project>
\ No newline at end of file
diff --git a/VisualC/SDL_test/SDL_test.vcxproj b/VisualC/SDL_test/SDL_test.vcxproj
index 8148024c9245..f69b2e5f6b87 100644
--- a/VisualC/SDL_test/SDL_test.vcxproj
+++ b/VisualC/SDL_test/SDL_test.vcxproj
@@ -100,6 +100,7 @@
       <WarningLevel>Level3</WarningLevel>
       <DebugInformationFormat>OldStyle</DebugInformationFormat>
       <OmitDefaultLibName>true</OmitDefaultLibName>
+      <MultiProcessorCompilation>true</MultiProcessorCompilation>
     </ClCompile>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
@@ -116,6 +117,7 @@
       <WarningLevel>Level3</WarningLevel>
       <DebugInformationFormat>OldStyle</DebugInformationFormat>
       <OmitDefaultLibName>true</OmitDefaultLibName>
+      <MultiProcessorCompilation>true</MultiProcessorCompilation>
     </ClCompile>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
@@ -134,6 +136,7 @@
       <WarningLevel>Level3</WarningLevel>
       <DebugInformationFormat>OldStyle</DebugInformationFormat>
       <OmitDefaultLibName>true</OmitDefaultLibName>
+      <MultiProcessorCompilation>true</MultiProcessorCompilation>
     </ClCompile>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
@@ -150,6 +153,7 @@
       <WarningLevel>Level3</WarningLevel>
       <DebugInformationFormat>OldStyle</DebugInformationFormat>
       <OmitDefaultLibName>true</OmitDefaultLibName>
+      <MultiProcessorCompilation>true</MultiProcessorCompilation>
     </ClCompile>
   </ItemDefinitionGroup>
   <ItemGroup>
@@ -168,4 +172,4 @@
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>
-</Project>
+</Project>
\ No newline at end of file