Don't explicitly use any C runtime library with Visual Studio

Visual Studio will still use Multi-threaded DLL by default, but since we don't link with a C runtime we won't end up with any Visual Studio runtime dependency.

This fixes https://github.com/libsdl-org/SDL/issues/4328

VisualC/SDL/SDL.vcxproj

@@ -102,7 +102,6 @@
       <AdditionalIncludeDirectories>$(ProjectDir)/../../include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <AdditionalUsingDirectories>%(AdditionalUsingDirectories)</AdditionalUsingDirectories>
       <PreprocessorDefinitions>DLL_EXPORT;_DEBUG;_WINDOWS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
       <BufferSecurityCheck>false</BufferSecurityCheck>
       <EnableEnhancedInstructionSet>StreamingSIMDExtensions</EnableEnhancedInstructionSet>
       <WarningLevel>Level3</WarningLevel>
@@ -133,7 +132,6 @@
       <AdditionalIncludeDirectories>$(ProjectDir)/../../include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <AdditionalUsingDirectories>%(AdditionalUsingDirectories)</AdditionalUsingDirectories>
       <PreprocessorDefinitions>DLL_EXPORT;_DEBUG;_WINDOWS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
       <BufferSecurityCheck>false</BufferSecurityCheck>
       <WarningLevel>Level3</WarningLevel>
       <DebugInformationFormat>OldStyle</DebugInformationFormat>
@@ -166,7 +164,6 @@
       <AdditionalIncludeDirectories>$(ProjectDir)/../../include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <AdditionalUsingDirectories>%(AdditionalUsingDirectories)</AdditionalUsingDirectories>
       <PreprocessorDefinitions>DLL_EXPORT;NDEBUG;_WINDOWS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
       <BufferSecurityCheck>false</BufferSecurityCheck>
       <EnableEnhancedInstructionSet>StreamingSIMDExtensions</EnableEnhancedInstructionSet>
       <WarningLevel>Level3</WarningLevel>
@@ -198,7 +195,6 @@
       <AdditionalIncludeDirectories>$(ProjectDir)/../../include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <AdditionalUsingDirectories>%(AdditionalUsingDirectories)</AdditionalUsingDirectories>
       <PreprocessorDefinitions>DLL_EXPORT;NDEBUG;_WINDOWS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
       <BufferSecurityCheck>false</BufferSecurityCheck>
       <WarningLevel>Level3</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
@@ -613,4 +609,4 @@
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>
-</Project>
+</Project>