sync code with last improvements from OpenBSD

lib/libepoxy/generated/Makefile

@@ -0,0 +1,44 @@
+# $OpenBSD: Makefile,v 1.2 2018/05/25 06:24:59 matthieu Exp $
+
+EPOXY=	${.CURDIR}/../../../dist/libepoxy
+
+PYTHON=		python${PYTHON_VERSION}
+PYTHON_FLAGS=	-t -O -O
+
+GENERATED= \
+	src/gl_generated_dispatch.c \
+	src/glx_generated_dispatch.c \
+	src/egl_generated_dispatch.c
+
+all: ${GENERATED}
+
+obj:
+
+depend:
+
+install:
+
+clean distclean:
+	rm -f ${GENERATED}
+
+src/gl_generated_dispatch.c: registry/gl.xml
+	$(PYTHON) $(PYTHON_FLAGS) ${EPOXY}/src/gen_dispatch.py \
+	    --srcdir ${.CURDIR}/src --includedir ${.CURDIR}/include/epoxy \
+	    ${EPOXY}/registry/gl.xml
+
+src/glx_generated_dispatch.c: registry/glx.xml
+	$(PYTHON) $(PYTHON_FLAGS) ${EPOXY}/src/gen_dispatch.py \
+	    --srcdir ${.CURDIR}/src --includedir ${.CURDIR}/include/epoxy \
+	    ${EPOXY}/registry/glx.xml
+
+src/egl_generated_dispatch.c: registry/egl.xml
+	$(PYTHON) $(PYTHON_FLAGS) ${EPOXY}/src/gen_dispatch.py \
+	    --srcdir ${.CURDIR}/src --includedir ${.CURDIR}/include/epoxy \
+	    ${EPOXY}/registry/egl.xml
+
+.SUFFIXES: .py .xml
+
+.PATH:	${EPOXY}
+.PATH:	${EPOXY}/src
+
+.include <bsd.xorg.mk>