Added htmlhelp.exe as it failed to download

Author: doxygen

.github/workflows/build-doxygen.yml

@@ -177,7 +177,7 @@ jobs:
     - name: Download htmlhelp (Windows)
       if: matrix.platform == 'windows'
       run: |
-        curl -L -o htmlhelp.exe http://web.archive.org/web/20160201063255/http://download.microsoft.com/download/0/A/9/0A939EF6-E31C-430F-A3DF-DFAE7960D564/htmlhelp.exe
+        @rem curl -L -o htmlhelp.exe http://web.archive.org/web/20160201063255/http://download.microsoft.com/download/0/A/9/0A939EF6-E31C-430F-A3DF-DFAE7960D564/htmlhelp.exe
         ./htmlhelp.exe /VERYSILENT /SUPPRESSMSGBOXES /NORESTART
       shell: pwsh