Revert "Allow env.sh to accept additional env var names (#3339)"

This reverts commit 27e3d4e.

src/Misc/layoutroot/env.sh

@@ -1,13 +1,13 @@
 #!/bin/bash
 
 varCheckList=(
-    'LANG'
-    'JAVA_HOME'
-    'ANT_HOME'
-    'M2_HOME'
-    'ANDROID_HOME'
-    'GRADLE_HOME'
-    'NVM_BIN'
+    'LANG' 
+    'JAVA_HOME' 
+    'ANT_HOME' 
+    'M2_HOME' 
+    'ANDROID_HOME' 
+    'GRADLE_HOME' 
+    'NVM_BIN' 
     'NVM_PATH'
     'VSTS_HTTP_PROXY'
     'VSTS_HTTP_PROXY_USERNAME'
@@ -17,16 +17,6 @@ varCheckList=(
     'AGENT_TOOLSDIRECTORY'
     )
 
-# Allows the caller to specify additional vars on the commandline, for example:
-# ./env.sh DOTNET_SYSTEM_GLOBALIZATION_INVARIANT DOTNET_ROOT
-for arg in "$@"
-do
-    if [[ ! " ${varCheckList[@]} " =~ " ${arg} " ]]; then
-        varCheckList+=($arg)
-    fi
-done
-
-
 envContents=""
 
 if [ -f ".env" ]; then
@@ -44,7 +34,7 @@ function writeVar()
         if [ ! -z "${!checkVar}" ]; then
             echo "${checkVar}=${!checkVar}">>.env
         fi
-    fi
+    fi 
 }
 
 echo $PATH>.path