Make output directories unique for these projects

Apparently one was copied from the other and used the same original
output file subdirectory name ("upgrade") oops.

src/sbbs3/upgrade_to_v319.vcxproj

@@ -58,12 +58,12 @@
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <LinkIncremental>true</LinkIncremental>
     <OutDir>.\msvc.win32.exe.debug\</OutDir>
-    <IntDir>.\msvc.win32.debug\upgrade\</IntDir>
+    <IntDir>.\msvc.win32.debug\upgrade_to_v319\</IntDir>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <LinkIncremental>false</LinkIncremental>
     <OutDir>.\msvc.win32.exe.release\</OutDir>
-    <IntDir>.\msvc.win32.release\upgrade\</IntDir>
+    <IntDir>.\msvc.win32.release\upgrade_to_v319\</IntDir>
   </PropertyGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <ClCompile>

src/sbbs3/upgrade_to_v320.vcxproj

@@ -58,12 +58,12 @@
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <LinkIncremental>true</LinkIncremental>
     <OutDir>.\msvc.win32.exe.debug\</OutDir>
-    <IntDir>.\msvc.win32.debug\upgrade\</IntDir>
+    <IntDir>.\msvc.win32.debug\upgrade_to_v320\</IntDir>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <LinkIncremental>false</LinkIncremental>
     <OutDir>.\msvc.win32.exe.release\</OutDir>
-    <IntDir>.\msvc.win32.release\upgrade\</IntDir>
+    <IntDir>.\msvc.win32.release\upgrade_to_v320\</IntDir>
   </PropertyGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <ClCompile>