Add the build directory to the include path for git_version.h

aegisub/build/aegisub_vs2008/libaegisub_include_dir.vsprops

@@ -6,6 +6,6 @@
 	>
 	<Tool
 		Name="VCCLCompilerTool"
-		AdditionalIncludeDirectories="&quot;$(ProjectDir)\..&quot;;&quot;$(ProjectDir)\..\..\libaegisub\include&quot;"
+		AdditionalIncludeDirectories="&quot;$(ProjectDir)\..&quot;;&quot;$(ProjectDir)\..\..\libaegisub\include&quot;;&quot;$(ProjectDir)\..&quot;"
 	/>
 </VisualStudioPropertySheet>