Revert Tools/buildbot/external-common.bat to normal (with updated versions).

diff --cc Tools/buildbot/external-common.bat
index ae00d3e3e2febb1f29734db345be2c747bfc6e63,76fe7d26db302a41d836bafb43b39e414da3d82c..8e62cf7fedbc74d32cc066cbb57b6e9df731d05d
--- 1/Tools/buildbot/external-common.bat
--- 2/Tools/buildbot/external-common.bat
+++ b/Tools/buildbot/external-common.bat
@@@ -5,25 -5,13 +5,13 @@@ cd .
  @rem XXX: If you need to force the buildbots to start from a fresh environment, uncomment
  @rem the following, check it in, then check it out, comment it out, then check it back in.
  @rem if exist bzip2-1.0.6 rd /s/q bzip2-1.0.6
- if exist tcltk rd /s/q tcltk
- if exist tcltk64 rd /s/q tcltk64
- if exist tcl8.4.12 rd /s/q tcl8.4.12
- if exist tcl8.4.16 rd /s/q tcl8.4.16
- if exist tcl-8.4.18.1 rd /s/q tcl-8.4.18.1
- if exist tcl-8.5.2.1 rd /s/q tcl-8.5.2.1
- if exist tcl-8.5.9.0 rd /s/q tcl-8.5.9.0
- if exist tcl-8.5.11.0 rd /s/q tcl-8.5.11.0
- if exist tcl-8.6.1.0 rd /s/q tcl-8.6.1.0
- if exist tk8.4.12 rd /s/q tk8.4.12
- if exist tk8.4.16 rd /s/q tk8.4.16
- if exist tk-8.4.18.1 rd /s/q tk-8.4.18.1
- if exist tk-8.5.2.0 rd /s/q tk-8.5.2.0
- if exist tk-8.5.9.0 rd /s/q tk-8.5.9.0
- if exist tk-8.5.11.0 rd /s/q tk-8.5.11.0
- if exist tk-8.6.1.0 rd /s/q tk-8.6.1.0
+ @rem if exist tcltk rd /s/q tcltk
+ @rem if exist tcltk64 rd /s/q tcltk64
+ @rem if exist tcl-8.6.1.0 rd /s/q tcl-8.6.1.0
+ @rem if exist tk-8.6.1.0 rd /s/q tk-8.6.1.0
  @rem if exist db-4.4.20 rd /s/q db-4.4.20
  @rem if exist openssl-1.0.1e rd /s/q openssl-1.0.1g
 -@rem if exist sqlite-3.7.12 rd /s/q sqlite-3.7.12    
 +@rem if exist sqlite-3.7.12 rd /s/q sqlite-3.7.12
  
  @rem bzip
  if not exist bzip2-1.0.6 (