games-sports/torcs: Fix building with GCC-7

Closes: https://bugs.gentoo.org/631542
Package-Manager: Portage-2.3.16, Repoman-2.3.6
Closes: https://github.com/gentoo/gentoo/pull/7728

games-sports/torcs/files/torcs-1.3.6-gcc7.patch

@@ -0,0 +1,11 @@
+--- a/src/libs/musicplayer/OpenALMusicPlayer.cpp
++++ b/src/libs/musicplayer/OpenALMusicPlayer.cpp
+@@ -161,7 +161,7 @@
+ {
+ 	char pcm[BUFFERSIZE];
+ 	int size = 0;
+-	const char* error = '\0';
++	const char* error = "";
+ 	
+ 	if (!stream->read(pcm, BUFFERSIZE, &size, &error)) {
+ 		GfError("OpenALMusicPlayer: Stream read error: %s\n", error);

games-sports/torcs/torcs-1.3.6-r1.ebuild

@@ -1,4 +1,4 @@
-# Copyright 1999-2017 Gentoo Foundation
+# Copyright 1999-2018 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=6
@@ -34,6 +34,7 @@ PATCHES=(
 	"${FILESDIR}"/${P}-format.patch
 	"${FILESDIR}"/${P}-noXmuXt.patch
 	"${FILESDIR}"/${P}-gcc6.patch
+	"${FILESDIR}"/${P}-gcc7.patch
 )
 
 src_prepare() {