Redirect output files to the output folder

Thou linker can locate the output .lib file of referenced projects
wherever .lib is just fine, this helps us to gather all .pdb files in
the output folder.

Signed-off-by: Simon Rozman <simon@rozman.si>

build/stdex.vcxproj

@@ -54,6 +54,9 @@
     <Import Project="..\..\..\include\$(Configuration).props" Condition="exists('..\..\..\include\$(Configuration).props')" />
   </ImportGroup>
   <PropertyGroup Label="UserMacros" />
+  <PropertyGroup>
+    <OutDir>..\..\..\output\$(Platform).$(Configuration)\</OutDir>
+  </PropertyGroup>
   <ItemDefinitionGroup>
     <ClCompile>
       <PrecompiledHeader>Use</PrecompiledHeader>