project files: remove remaining GTEST_DIR macro

- The VC 9.0 Debug had a GTEST_DIR artifact still lingering in the
  config which caused a build warning.

[#5 state:cooking tag:branch-next]

Acked by: Jocelyn Legault
Signed-off-by: Thell Fowler <git@tbfowler.name>

PowerEditor/visual.net/notepadPlus.9.vcproj

@@ -42,7 +42,7 @@
 			<Tool
 				Name="VCCLCompilerTool"
 				Optimization="0"
-				AdditionalIncludeDirectories="..\..\scintilla\include;..\src;..\src\MISC;..\src\MISC\Common;..\src\MISC\Exception;..\src\MISC\PluginsManager;..\src\MISC\Process;..\src\MISC\RegExt;..\src\ScitillaComponent;..\src\TinyXml;..\src\TinyXml\tinyXmlA;..\src\WinControls;..\src\WinControls\AboutDlg;..\src\WinControls\ColourPicker;..\src\WinControls\ContextMenu;..\src\WinControls\DockingWnd;..\src\WinControls\Grid;..\src\WinControls\ImageListSet;..\src\WinControls\OpenSaveFileDialog;..\src\WinControls\Preference;..\src\WinControls\shortcut;..\src\WinControls\SplitterContainer;..\src\WinControls\StaticDialog;..\src\WinControls\StaticDialog\RunDlg;..\src\WinControls\StatusBar;..\src\WinControls\TabBar;..\src\WinControls\TaskList;..\src\WinControls\ToolBar;..\src\WinControls\ToolTip;..\src\WinControls\TrayIcon;..\src\WinControls\WindowsDlg;&quot;$(GTEST_DIR)\include&quot;"
+				AdditionalIncludeDirectories="..\..\scintilla\include;..\src;..\src\MISC;..\src\MISC\Common;..\src\MISC\Exception;..\src\MISC\PluginsManager;..\src\MISC\Process;..\src\MISC\RegExt;..\src\ScitillaComponent;..\src\TinyXml;..\src\TinyXml\tinyXmlA;..\src\WinControls;..\src\WinControls\AboutDlg;..\src\WinControls\ColourPicker;..\src\WinControls\ContextMenu;..\src\WinControls\DockingWnd;..\src\WinControls\Grid;..\src\WinControls\ImageListSet;..\src\WinControls\OpenSaveFileDialog;..\src\WinControls\Preference;..\src\WinControls\shortcut;..\src\WinControls\SplitterContainer;..\src\WinControls\StaticDialog;..\src\WinControls\StaticDialog\RunDlg;..\src\WinControls\StatusBar;..\src\WinControls\TabBar;..\src\WinControls\TaskList;..\src\WinControls\ToolBar;..\src\WinControls\ToolTip;..\src\WinControls\TrayIcon;..\src\WinControls\WindowsDlg"
 				PreprocessorDefinitions="WIN32;_DEBUG;_WINDOWS;TIXML_USE_STL;TIXMLA_USE_STL"
 				MinimalRebuild="true"
 				ExceptionHandling="2"