pgsql: Fix pg_rewind's handling of top-level symlinks.

Fix pg_rewind's handling of top-level symlinks.

The previous coding suffered a null-pointer dereference if it found any
symlink at the top level of $PGDATA. Fix that, and teach it to recurse
into a symlink for pg_xlog, but not anything else.

Per note from Abhijit Menon-Sen.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/0381fefaa44f04e17dffb7e46e7677374a4fb2c7

Modified Files
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src/bin/pg_rewind/copy_fetch.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)

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