[PATCH] hush.c - export -n flag support

[Bayram Kurumahmut]

Add support for export '-n' flag 

Tested as the followings

# export A=1 B=2
# export -n A=1
# export -n B
# export A=1 B=2 C=3
# export -n A B=2 C

Regards,
Bayram

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