sync code with last improvements from OpenBSD

lib/mesa/mk/libdri/Makefile

@@ -0,0 +1,39 @@
+#	$OpenBSD: Makefile,v 1.4 2023/01/28 08:56:34 jsg Exp $
+
+.include <bsd.xconf.mk>
+
+LIB=	dri
+
+NOPROFILE=
+
+SRCS=	dri_context.c \
+	dri_drawable.c \
+	dri_helpers.c \
+	dri_query_renderer.c \
+	dri_screen.c \
+	dri_util.c
+
+.if ${XENOCARA_BUILD_DRI:L} == "yes"
+SRCS+=	drisw.c \
+	dri2.c
+.endif
+
+.include "../Makefile.inc"
+
+CFLAGS+=	${C_VIS_ARGS}
+CPPFLAGS+=	-DGALLIUM_SOFTPIPE \
+		-I${MESA_SRC}/src/gallium/frontends/dri \
+		-I${MESA_SRC}/src/mapi \
+		-I${MESA_SRC}/src/mesa \
+		-I${MESA_SRC}/src/mesa/drivers/dri/common \
+		-I${MESA_SRC}/src/gallium/include \
+		-I${MESA_SRC}/src/gallium/auxiliary
+
+install:
+
+obj: _xenocara_obj
+
+.include <bsd.lib.mk>
+.include <bsd.xorg.mk>
+
+.PATH: ${MESA_SRC}/src/gallium/frontends/dri