libgo: don't unset in shell script
    
    Reportedly ksh fails to unset a variable that was not previously set.
    Change match.sh and gotest to not unset LANG, but instead set LANG=C.
    Also don't combine exporting and setting variable in a single statement.
    
    Reviewed-on: https://go-review.googlesource.com/26999

From-SVN: r239443
3 files changed