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do not set unchanged vars in xenv when generating shell scripts

Marco Clemencic requested to merge clemenci/Gaudi:minor-improvement-to-xenv into master

When using bash in conjunction with export -f, the string produced by xenv --sh cannot be used as argument to eval. Moreover, there is no real need to set variables if the value didn't change.

Note that the change affects only the options --sh and --csh of xenv.

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