Arrange for on_exit_nicely to be thread-safe.

Extracted from Joachim Wieland's parallel pg_dump patch, with some
additional comments by me.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/5e86c61a7eec0fdc6961493a150159fa8fc63b1c

Modified Files
--------------
src/bin/pg_dump/dumputils.c |   18 ++++++++++--------
1 files changed, 10 insertions(+), 8 deletions(-)

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