patch 9.1.0008: NSIS installer includes syntax testdir

Problem:  NSIS installer includes syntax test dumps
          (Yegappan Lakshmanan)
Solution: Exclude syntax/testdir when creating the NSIS installer

fixes: vim/vim-win32-installer#328
closes: #13814

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/nsis/gvim.nsi b/nsis/gvim.nsi
index 3a6dc29..adb38a4 100644
--- a/nsis/gvim.nsi
+++ b/nsis/gvim.nsi
@@ -416,7 +416,7 @@
 	File ${VIMSRC}\vim.ico
 
 	SetOutPath $0\syntax
-	File /r ${VIMRT}\syntax\*.*
+	File /r /x testdir ${VIMRT}\syntax\*.*
 
 	SetOutPath $0\spell
 	File ${VIMRT}\spell\*.txt