package/postgresql: bump version to 11.0

Release notes: https://www.postgresql.org/about/news/1894/

Added md5 hash provided by upstream.

To fix build errors "MAKELEVEL=0" is required by upstream in MAKE_OPTS:
https://www.postgresql-archive.org/BUG-15407-minor-build-depends-on-MAKELEVEL-being-0-at-top-Makefile-td6047685.html#a6047709

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
[Thomas: add a comment in the .mk file about MAKELEVEL=0]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/postgresql/postgresql.hash

@@ -1,5 +1,7 @@
-# From https://ftp.postgresql.org/pub/source/v10.5/postgresql-10.5.tar.bz2.sha256
-sha256	6c8e616c91a45142b85c0aeb1f29ebba4a361309e86469e0fb4617b6a73c4011	postgresql-10.5.tar.bz2
+# From https://ftp.postgresql.org/pub/source/v11.0/postgresql-11.0.tar.bz2.md5
+md5 338ede84c0443db02ff6e8c4c8cbc5e9  postgresql-11.0.tar.bz2
+# From https://ftp.postgresql.org/pub/source/v11.0/postgresql-11.0.tar.bz2.sha256
+sha256 bf9bba03d0c3902c188af12e454b35343c4a9bf9e377ec2fe50132efb44ef36b  postgresql-11.0.tar.bz2
 
 # License file, Locally calculated
 sha256	24cfc70cf16b3a23242c49ffce39510683bdd48cbedb8a46fe03976ee5f5c21e	COPYRIGHT

package/postgresql/postgresql.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-POSTGRESQL_VERSION = 10.5
+POSTGRESQL_VERSION = 11.0
 POSTGRESQL_SOURCE = postgresql-$(POSTGRESQL_VERSION).tar.bz2
 POSTGRESQL_SITE = http://ftp.postgresql.org/pub/source/v$(POSTGRESQL_VERSION)
 POSTGRESQL_LICENSE = PostgreSQL
@@ -17,6 +17,11 @@ POSTGRESQL_CONF_ENV = \
 	pgac_cv_snprintf_size_t_support=yes
 POSTGRESQL_CONF_OPTS = --disable-rpath
 
+# https://www.postgresql.org/docs/11/static/install-procedure.html:
+# "If you want to invoke the build from another makefile rather than
+# manually, you must unset MAKELEVEL or set it to zero"
+POSTGRESQL_MAKE_OPTS = MAKELEVEL=0
+
 ifeq ($(BR2_TOOLCHAIN_USES_UCLIBC),y)
 # PostgreSQL does not build against uClibc with locales
 # enabled, due to an uClibc bug, see