Issue #28846: Various installer fixes

diff --cc Tools/msi/buildrelease.bat
index f203bada4994a9428d55ffee275d3079e6293716,4659a32b838cc1793cc0bbb3d4edec308055b46e..d144c2ce35c8efd330849b3525a2e394f64408e0
--- 1/Tools/msi/buildrelease.bat
--- 2/Tools/msi/buildrelease.bat
+++ b/Tools/msi/buildrelease.bat
@@@ -78,12 -81,9 +81,9 @@@ call "%D%..\..\doc\make.bat" htmlhel
  if errorlevel 1 goto :eof\r
  :skipdoc\r
  \r
- where hg > "%TEMP%\hg.loc" 2> nul && set /P HG= < "%TEMP%\hg.loc" & del "%TEMP%\hg.loc"\r
- if not exist "%HG%" echo Cannot find Mercurial on PATH && exit /B 1\r
- \r
  where dlltool /q && goto skipdlltoolsearch\r
  set _DLLTOOL_PATH=\r
 -where /R "%EXTERNALS%\" dlltool > "%TEMP%\dlltool.loc" 2> nul && set /P _DLLTOOL_PATH= < "%TEMP%\dlltool.loc" & del "%TEMP%\dlltool.loc" \r
 +where /R "%EXTERNALS%\" dlltool > "%TEMP%\dlltool.loc" 2> nul && set /P _DLLTOOL_PATH= < "%TEMP%\dlltool.loc" & del "%TEMP%\dlltool.loc"\r
  if not exist "%_DLLTOOL_PATH%" echo Cannot find binutils on PATH or in external && exit /B 1\r
  for %%f in (%_DLLTOOL_PATH%) do set PATH=%PATH%;%%~dpf\r
  set _DLLTOOL_PATH=\r