Don't trash input list structure in does_not_exist_skipping().

The trigger and rule cases need to split up the input name list, but
they mustn't corrupt the passed-in data structure, since it could be part
of a cached utility-statement parsetree.  Per bug #7641.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/75af5ae9c017d70531bd49178adfd3103cd40a76

Modified Files
--------------
src/backend/commands/dropcmds.c |    4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)

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