Bug 101560 - clear some more env vars so that system calls will run in

taint mode. The perforce integration stuff needs this.

r=gerv,mattyt

webtools/bugzilla/globals.pl

@@ -74,8 +74,7 @@ use Date::Parse;               # For str2time().
 use RelationSet;
 
 # Some environment variables are not taint safe
-delete $ENV{PATH};
-delete $ENV{BASH_ENV};
+delete $ENV{qw(PATH IFS CDPATH ENV BASH_ENV)};
 
 # Contains the version string for the current running Bugzilla.
 $::param{'version'} = '2.15';