libretro-dosbox-pure: fix URL and build

add patch to disable CPU-guessing from /proc/cpuinfo and adding
ARM optimization flags

Signed-off-by: Matthias Reichl <hias@horus.com>

packages/emulation/libretro-dosbox-pure/package.mk

@@ -5,8 +5,8 @@ PKG_NAME="libretro-dosbox-pure"
 PKG_VERSION="4d70760d65140c97634d2d6e8a9876e571790670"
 PKG_SHA256="4f9a260dc097eb357e68b81d87c72a38a3ca2bef16898f4d0385e8b73fad50b7"
 PKG_LICENSE="GPLv2"
-PKG_SITE="https://github.com/schellingb/dosbox-pure"
-PKG_URL="https://github.com/schellingb/dosbox-pure/archive/${PKG_VERSION}.tar.gz"
+PKG_SITE="https://github.com/libretro/dosbox-pure"
+PKG_URL="https://github.com/libretro/dosbox-pure/archive/${PKG_VERSION}.tar.gz"
 PKG_DEPENDS_TARGET="toolchain kodi-platform"
 PKG_LONGDESC="game.libretro.dosbox-pure: DOSBox-Pure for Kodi"
 PKG_BUILD_FLAGS="+pic"

packages/emulation/libretro-dosbox-pure/patches/libretro-dosbox-pure-001-cross-compile-fix.patch

@@ -0,0 +1,22 @@
+diff --git a/Makefile b/Makefile
+index fed5ce1..6f1b23c 100644
+--- a/Makefile
++++ b/Makefile
+@@ -150,6 +150,9 @@ else
+   CXX     ?= g++
+   LDFLAGS := -Wl,--gc-sections -fno-ident
+   COMMONFLAGS += -pthread
++ifeq (1,1) # always
++  CPUFLAGS :=
++else
+   # ARM optimizations
+   PROCCPU := $(shell cat /proc/cpuinfo))
+   ifneq ($(and $(filter ARMv7,$(PROCCPU)),$(filter neon,$(PROCCPU))),)
+@@ -174,6 +177,7 @@ else
+     CXX := g++-9
+   endif
+ endif
++endif
+ 
+ ifeq ($(BUILD),DEBUG)
+   BUILDDIR := debug