MSVC: cleanup and enable SDLCheck

SRB2_common.props

@@ -15,7 +15,7 @@
       <BrowseInformation>true</BrowseInformation>
       <TreatWarningAsError>true</TreatWarningAsError>
       <EnablePREfast>false</EnablePREfast>
-      <SDLCheck>false</SDLCheck>
+      <SDLCheck>true</SDLCheck>
       <DisableSpecificWarnings>4244;4267</DisableSpecificWarnings>
     </ClCompile>
     <Link>

SRB2_x86.props

@@ -7,16 +7,6 @@
     <ClCompile>
       <PreprocessorDefinitions>USEASM;%(PreprocessorDefinitions)</PreprocessorDefinitions>
     </ClCompile>
-    <CustomBuild />
-    <CustomBuild />
-    <CustomBuild />
-    <PreBuildEvent>
-      <Command>
-      </Command>
-    </PreBuildEvent>
-    <CustomBuildStep />
-    <CustomBuildStep />
-    <CustomBuildStep />
     <Link>
       <ImageHasSafeExceptionHandlers>false</ImageHasSafeExceptionHandlers>
     </Link>

libs/SDL2_common.props

@@ -4,7 +4,7 @@
   <PropertyGroup Label="UserMacros" />
   <PropertyGroup>
     <IncludePath>$(SolutionDir)libs\SDL2\include;$(IncludePath)</IncludePath>
-    <LibraryPath>..\..\libs\SDL2\lib\$(PlatformTarget);$(LibraryPath)</LibraryPath>
+    <LibraryPath>$(SolutionDir)libs\SDL2\lib\$(PlatformTarget);$(LibraryPath)</LibraryPath>
   </PropertyGroup>
   <ItemDefinitionGroup>
     <Link>

libs/SDL_mixer_common.props

@@ -4,7 +4,7 @@
   <PropertyGroup Label="UserMacros" />
   <PropertyGroup>
     <IncludePath>$(SolutionDir)libs\SDL2_mixer\include;$(IncludePath)</IncludePath>
-	<LibraryPath>..\..\libs\SDL2_mixer\lib\$(PlatformTarget);$(LibraryPath)</LibraryPath>
+	<LibraryPath>$(SolutionDir)libs\SDL2_mixer\lib\$(PlatformTarget);$(LibraryPath)</LibraryPath>
   </PropertyGroup>
   <ItemDefinitionGroup>
     <Link>