Prevent pg_upgrade from crashing if it can't write to the current
directory.

Backpatch to 9.2.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/85642ec00b5e0c58d2504b10c079693b8fb28cc5

Modified Files
--------------
contrib/pg_upgrade/util.c |    3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)

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