pgsql: pg_upgrade: quote directory names in delete_old_cluster script

pg_upgrade: quote directory names in delete_old_cluster script

This allows the delete script to properly function when special
characters appear in directory paths, e.g. spaces.

Backpatch through 9.0

Branch
------
REL9_2_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/66f5217f52aa131fc812bb40a99a772a1ab6c575

Modified Files
--------------
contrib/pg_upgrade/check.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

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