Fix Visual Studio 2017 build of Debug D3D8.

Visual Studio 2017 doesn't like configuration elements with empty
content. Remove it to use the default value.

Change-Id: Idc4f281aff145c7e9a143c0a5dbdd54eb4658ee9
Reviewed-on: https://swiftshader-review.googlesource.com/13128
Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
diff --git a/src/D3D8/D3D8.vcxproj b/src/D3D8/D3D8.vcxproj
index bfba294..7683bf5 100644
--- a/src/D3D8/D3D8.vcxproj
+++ b/src/D3D8/D3D8.vcxproj
@@ -103,8 +103,6 @@
       <ModuleDefinitionFile>d3d8.def</ModuleDefinitionFile>

       <GenerateDebugInformation>true</GenerateDebugInformation>

       <AssemblyDebug>true</AssemblyDebug>

-      <ProgramDatabaseFile>

-      </ProgramDatabaseFile>

       <GenerateMapFile>true</GenerateMapFile>

       <MapExports>true</MapExports>

       <SubSystem>Windows</SubSystem>