Change all $(SolutionDir) to $(ProjectDir)

Signed-off-by: Nathan Hjelm <hjelmn@me.com>
diff --git a/msvc/libusb_dll_2013.vcxproj b/msvc/libusb_dll_2013.vcxproj
index 65f03d1..fb3242f 100644
--- a/msvc/libusb_dll_2013.vcxproj
+++ b/msvc/libusb_dll_2013.vcxproj
@@ -39,8 +39,8 @@
   <PropertyGroup Label="UserMacros" />
   <PropertyGroup>
     <_ProjectFileVersion>10.0.30319.1</_ProjectFileVersion>
-    <IntDir>$(SolutionDir)..\$(Platform)\$(Configuration)\dll\$(TargetName)\</IntDir>
-    <OutDir>$(SolutionDir)..\$(Platform)\$(Configuration)\dll\</OutDir>
+    <IntDir>$(ProjectDir)..\$(Platform)\$(Configuration)\dll\$(TargetName)\</IntDir>
+    <OutDir>$(ProjectDir)..\$(Platform)\$(Configuration)\dll\</OutDir>
     <TargetName>libusb-1.0</TargetName>
   </PropertyGroup>
   <ItemDefinitionGroup>