sync code with last improvements from OpenBSD

lib/mesa/mk/libGLESv2/Makefile

@@ -0,0 +1,25 @@
+#	$OpenBSD: Makefile,v 1.4 2023/01/31 03:29:36 jsg Exp $
+
+LIB=	GLESv2
+
+SRCS=	entry.c
+
+.include "../Makefile.inc"
+
+CFLAGS+=	${C_VIS_ARGS}
+CPPFLAGS+=	-DMAPI_MODE_BRIDGE \
+		-DMAPI_ABI_HEADER=\"${MESA_SRC}/generated/src/mapi/es2api/glapi_mapi_tmp.h\"
+
+LDADD+= -L${.CURDIR}/../libglapi/${__objdir} -lglapi \
+	${.CURDIR}/../libmesa_util_c11/${__objdir}/libmesa_util_c11.a \
+	-L${X11BASE}/lib -ldrm -lm -lpthread
+
+obj: _xenocara_obj
+
+beforeinstall:
+	rm -f ${DESTDIR}${LIBDIR}/lib${LIB}.la
+
+.include <bsd.lib.mk>
+.include <bsd.xorg.mk>
+
+.PATH: ${MESA_SRC}/src/mapi