gnugo: fix compilation error due to duplicate symbols

-fcommon works around issue for cross-compilation, but with ubuntu
21.10 issue happens for hostbuild as well. Fix core issue instead
having to change hostbuild flags as well.

packages/gnugo/build.sh

@@ -3,7 +3,7 @@ TERMUX_PKG_DESCRIPTION="Program that plays the game of Go"
 TERMUX_PKG_LICENSE="GPL-3.0"
 TERMUX_PKG_MAINTAINER="@termux"
 TERMUX_PKG_VERSION=3.8
-TERMUX_PKG_REVISION=4
+TERMUX_PKG_REVISION=5
 TERMUX_PKG_SRCURL=https://mirrors.kernel.org/gnu/gnugo/gnugo-${TERMUX_PKG_VERSION}.tar.gz
 TERMUX_PKG_SHA256=da68d7a65f44dcf6ce6e4e630b6f6dd9897249d34425920bfdd4e07ff1866a72
 TERMUX_PKG_DEPENDS="ncurses, readline"
@@ -11,10 +11,6 @@ TERMUX_PKG_EXTRA_CONFIGURE_ARGS="--with-readline"
 TERMUX_PKG_HOSTBUILD=true
 TERMUX_PKG_GROUPS="games"
 
-termux_step_pre_configure() {
-	CFLAGS+=" -Wno-overflow -fcommon"
-}
-
 termux_step_post_configure () {
 	cp $TERMUX_PKG_HOSTBUILD_DIR/patterns/mkeyes $TERMUX_PKG_BUILDDIR/patterns/mkeyes
 	cp $TERMUX_PKG_HOSTBUILD_DIR/patterns/uncompress_fuseki $TERMUX_PKG_BUILDDIR/patterns/uncompress_fuseki

packages/gnugo/no-duplicate-symbols.patch.beforehostbuild

@@ -0,0 +1,26 @@
+--- ../unconditional.c.orig	2022-02-08 06:47:33.832807668 +0000
++++ ./engine/unconditional.c	2022-02-08 06:47:59.759417274 +0000
+@@ -29,6 +29,10 @@
+ 
+ #include "liberty.h"
+ 
++/* Unconditionally meaningless moves. */
++int meaningless_black_moves[BOARDMAX];
++int meaningless_white_moves[BOARDMAX];
++
+ /* Capture as many strings of the given color as we can. Played stones
+  * are left on the board and the number of played stones is returned.
+  * Strings marked in the exceptions array are excluded from capturing
+--- ../liberty.h.orig	2022-02-08 06:41:21.633651516 +0000
++++ ./engine/liberty.h	2022-02-08 06:47:51.259435972 +0000
+@@ -856,10 +856,6 @@
+ 
+ extern struct worm_data worm[BOARDMAX];
+ 
+-/* Unconditionally meaningless moves. */
+-int meaningless_black_moves[BOARDMAX];
+-int meaningless_white_moves[BOARDMAX];
+-
+ /* Surround cache (see surround.c) */
+ 
+ #define MAX_SURROUND 10