[PATCH] opcodes/riscv: make riscv_options[] const

[Jan Beulich]

There's no reason to allow the array to be modifiable. In fact the
compiler is able to infer this, placing the array in .data.rel.ro, but
let's make it explicit.

--- a/opcodes/riscv-dis.c
+++ b/opcodes/riscv-dis.c
@@ -1610,7 +1610,7 @@ typedef enum
 
 /* Valid RISCV disassembler options.  */
 
-static struct
+static const struct
 {
   const char *name;
   const char *description;