postgresql: security bump to version 9.6.6

Fixes the following security issues:

CVE-2017-12172: Start scripts permit database administrator to modify
root-owned files.

CVE-2017-15098: Memory disclosure in JSON functions.

CVE-2017-15099: INSERT ... ON CONFLICT DO UPDATE fails to enforce SELECT
privileges.

See the announcement for more details:
https://www.postgresql.org/about/news/1801/

While we're at it, also add a hash for the license file.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
(cherry picked from commit b97353f2b50add10971e8477ad0b4cede9244578)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/postgresql/postgresql.hash

@@ -1,2 +1,4 @@
-# From https://ftp.postgresql.org/pub/source/v9.6.5/postgresql-9.6.5.tar.bz2.sha256
-sha256 06da12a7e3dddeb803962af8309fa06da9d6989f49e22865335f0a14bad0744c  postgresql-9.6.5.tar.bz2
+# From https://ftp.postgresql.org/pub/source/v9.6.6/postgresql-9.6.6.tar.bz2.sha256
+sha256 399cdffcb872f785ba67e25d275463d74521566318cfef8fe219050d063c8154  postgresql-9.6.6.tar.bz2
+# License file, Locally calculated
+sha256 7dc8de32741ad1b03e21710771b55a1b9d460671d47f28a8840f917e38c66676  COPYRIGHT

package/postgresql/postgresql.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-POSTGRESQL_VERSION = 9.6.5
+POSTGRESQL_VERSION = 9.6.6
 POSTGRESQL_SOURCE = postgresql-$(POSTGRESQL_VERSION).tar.bz2
 POSTGRESQL_SITE = http://ftp.postgresql.org/pub/source/v$(POSTGRESQL_VERSION)
 POSTGRESQL_LICENSE = PostgreSQL