addpatch: hatari

Fix duplicate REG_A0. Patch taken from Debian.

hatari/fix-rega0-for-riscv.patch

@@ -0,0 +1,18 @@
+Description: Fix issue where REG_A0 is already defined by riscv64 platform
+Author: Tien Hock Loh <tienhock.loh@starfivetech.com>
+Forwarded: https://listengine.tuxfamily.org/lists.tuxfamily.org/hatari-devel/2022/06/msg00140.html
+
+Index: hatari-2.3.1+dfsg/src/includes/m68000.h
+===================================================================
+--- pkg-hatari.orig/src/includes/m68000.h
++++ pkg-hatari/src/includes/m68000.h
+@@ -15,6 +15,9 @@
+ /*			a possible pairing between add.l (a5,d1.w),d0	*/
+ /*			and move.b 7(a5,d1.w),d5.			*/
+
++#ifdef REG_A0
++#undef REG_A0
++#endif
+
+ #ifndef HATARI_M68000_H
+ #define HATARI_M68000_H

hatari/riscv64.patch

@@ -0,0 +1,20 @@
+--- PKGBUILD
++++ PKGBUILD
+@@ -24,8 +24,15 @@ optdepends=(
+   'python: for atari-convert-dir'
+   'sh: for atari-hd-image, zip2st, hatari-prg-args'
+ )
+-source=("https://download.tuxfamily.org/${pkgname}/${pkgver}/${pkgname}-${pkgver}.tar.bz2")
+-sha256sums=('2a5da1932804167141de4bee6c1c5d8d53030260fe7fe7e31e5e71a4c00e0547')
++source=("https://download.tuxfamily.org/${pkgname}/${pkgver}/${pkgname}-${pkgver}.tar.bz2"
++        "fix-rega0-for-riscv.patch")
++sha256sums=('2a5da1932804167141de4bee6c1c5d8d53030260fe7fe7e31e5e71a4c00e0547'
++            '97aa3956079f3636865cb26b40e82a7c97fda92341adbef9d2e6878a5cde5ab4')
++
++prepare() {
++  cd ${pkgname}-${pkgver}
++  patch -Np1 -i ../fix-rega0-for-riscv.patch
++}
+
+ build() {
+   cd ${pkgname}-${pkgver}