games-board/polyglot: Fix compilation with -fno-common.

Closes: https://bugs.gentoo.org/706976
Package-Manager: Portage-2.3.85, Repoman-2.3.20
Signed-off-by: Ulrich Müller <ulm@gentoo.org>

games-board/polyglot/files/polyglot-1.4.70b-no-common.patch

@@ -0,0 +1,14 @@
+https://bugs.gentoo.org/706976
+
+--- polyglot-1.4.70b-orig/pgheader.h
++++ polyglot-1.4.70b/pgheader.h
+@@ -10,9 +10,6 @@
+ #define PGHEADER_BAD_HEADER 6
+ 
+ 
+-const char * pgheader_version;
+-const char * pgheader_magic;
+-
+ /* This does some heuristic tests to make it reasonably sure we are dealing
+    with a Polyglot book.
+ */

games-board/polyglot/polyglot-1.4.70b-r3.ebuild

@@ -1,7 +1,7 @@
-# Copyright 1999-2016 Gentoo Foundation
+# Copyright 1999-2020 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
-EAPI=6
+EAPI=7
 
 DESCRIPTION="Protocol adapter to run UCI chess engines under xboard"
 HOMEPAGE="http://hardy.uhasselt.be/Toga/"
@@ -12,4 +12,5 @@ LICENSE="GPL-2+"
 SLOT="0"
 KEYWORDS="~amd64 ~x86"
 
+PATCHES=( "${FILESDIR}"/${P}-no-common.patch )
 DOCS="AUTHORS ChangeLog TODO" # README* installed by build system