pgsql: Fix client-only installation

Fix client-only installation

The psql Makefile was not creating $(datadir) before installing
psqlrc.sample there.

In most cases, the directory would be created in some other way, but for
the documented from-source client-only installation procedure, it could
fail.

Reported-by: Mike Blackwell <mike.blackwell@rrd.com>

Branch
------
REL8_4_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/15699d9bf8562b47f6ac48018d028d557d33ca1b

Modified Files
--------------
src/bin/psql/Makefile | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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