package/gnuchess: security bump to version 6.2.7

Fix CVE-2019-15767: In GNU Chess 6.2.5, there is a stack-based buffer
overflow in the cmd_load function in frontend/cmd.cc via a crafted chess
position in an EPD file.

Update indentation in hash file (two spaces)

https://lists.gnu.org/archive/html/info-gnu-chess/2020-04/msg00000.html
https://lists.gnu.org/archive/html/info-gnu-chess/2020-05/msg00000.html

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/gnuchess/gnuchess.hash

@@ -1,3 +1,3 @@
 # sha256 locally computed
-sha256 9a99e963355706cab32099d140b698eda9de164ebce40a5420b1b9772dd04802  gnuchess-6.2.5.tar.gz
-sha256 8ceb4b9ee5adedde47b31e975c1d90c73ad27b6b165a1dcd80c7c545eb65b903  COPYING
+sha256  e536675a61abe82e61b919f6b786755441d9fcd4c21e1c82fb9e5340dd229846  gnuchess-6.2.7.tar.gz
+sha256  8ceb4b9ee5adedde47b31e975c1d90c73ad27b6b165a1dcd80c7c545eb65b903  COPYING

package/gnuchess/gnuchess.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-GNUCHESS_VERSION = 6.2.5
+GNUCHESS_VERSION = 6.2.7
 GNUCHESS_SITE = $(BR2_GNU_MIRROR)/chess
 GNUCHESS_LICENSE = GPL-3.0+
 GNUCHESS_LICENSE_FILES = COPYING