added build tags for riscv

chewxy · chewxy · commit 44ac149358bc · 2019-09-04T12:33:12.000+10:00
diff --git a/stubs_risc64.s b/stubs_risc64.s
@@ -1,3 +1,5 @@
+// +build riscv
+
 #include "textflag.h"
 
 // func Exp(x float32) float32
