add a Makefile for riscv64 man8

diff --git a/share/man/man8/man8.riscv64/Makefile b/share/man/man8/man8.riscv64/Makefile
new file mode 100644 (file)
index 0000000..be7a2c4
--- /dev/null
+++ b/share/man/man8/man8.riscv64/Makefile
@@ -0,0 +1,6 @@
+#      $OpenBSD: Makefile,v 1.1 2021/04/28 14:45:08 jsg Exp $
+
+MAN=   MAKEDEV.8
+MANSUBDIR=riscv64
+
+.include <bsd.prog.mk>