sync code with last improvements from OpenBSD

lib/mesa/mk/libamdgpuwinsys/Makefile

@@ -0,0 +1,29 @@
+#	$OpenBSD: Makefile,v 1.3 2021/07/22 11:10:09 jsg Exp $
+
+LIB=	amdgpuwinsys
+
+NOPROFILE=
+
+SRCS=	amdgpu_bo.c \
+	amdgpu_cs.c \
+	amdgpu_surface.c \
+	amdgpu_winsys.c
+
+.include "../Makefile.inc"
+
+CFLAGS+=	${C_VIS_ARGS}
+CPPFLAGS+=	-I${MESA_SRC}/src/gallium/include \
+		-I${MESA_SRC}/src/gallium/auxiliary \
+		-I${MESA_SRC}/src/gallium/winsys/amdgpu/drm \
+		-I${MESA_SRC}/src/amd/common \
+		-I${MESA_SRC}/src/amd/llvm \
+		-I${MESA_SRC}/generated/src/amd/common
+
+install:
+
+obj: _xenocara_obj
+
+.include <bsd.lib.mk>
+.include <bsd.xorg.mk>
+
+.PATH: ${MESA_SRC}/src/gallium/winsys/amdgpu/drm