Don't export CLING_STANDARD_PCH=none in setup scripts

This variable is set in the ROOT Python setup itself (see 470fddd), and
hence we don't need to do it in the setup scripts.

Author: guitargeek

config/thisroot.bat

@@ -14,4 +14,3 @@ set CMAKE_PREFIX_PATH=%ROOTSYS%;%CMAKE_PREFIX_PATH%
 set PYTHONPATH=%ROOTSYS%\bin;%PYTHONPATH%
 set OLDPATH=
 set THIS=
-set CLING_STANDARD_PCH="none"

config/thisroot.csh

@@ -232,9 +232,6 @@ else
    setenv JUPYTER_CONFIG_DIR ${ROOTSYS}/etc/notebook
 endif
 
-# Prevent Cppyy from checking the PCH (and avoid warning)
-setenv CLING_STANDARD_PCH none
-
 endif # if ("$thisroot" != "")
 
 set thisroot=

config/thisroot.fish

@@ -50,9 +50,6 @@ update_path CMAKE_PREFIX_PATH "$old_rootsys" "" $ROOTSYS
 update_path JUPYTER_PATH "$old_rootsys" "/etc/notebook" $ROOTSYS/etc/notebook
 update_path JUPYTER_CONFIG_DIR "$old_rootsys" "/etc/notebook" $ROOTSYS/etc/notebook
 
-# Prevent Cppyy from checking the PCH (and avoid warning)
-set -xg CLING_STANDARD_PCH none
-
 functions -e update_path
 set -e old_rootsys
 set -e thisroot

config/thisroot.ps1

@@ -7,4 +7,3 @@ $ROOTSYS = split-path -parent (get-item $scriptPath)
 $env:PATH = $ROOTSYS + '\bin;' + $env:PATH
 $env:CMAKE_PREFIX_PATH = $ROOTSYS + ';' + $env:CMAKE_PREFIX_PATH
 $env:PYTHONPATH = $ROOTSYS + '\bin;' + $env:PYTHONPATH
-$env:CLING_STANDARD_PCH = "none"

config/thisroot.sh

@@ -252,9 +252,6 @@ clean_environment
 set_environment
 
 
-# Prevent Cppyy from checking the PCH (and avoid warning)
-export CLING_STANDARD_PCH=none
-
 if (root-config --arch | grep -v win32gcc | grep -q -i win32); then
    ROOTSYS="$(cygpath -w "$ROOTSYS")"
 fi