[PATCH] Allow memset local PLT reference for RISC-V.

[Florian Weimer]

* Alistair Francis:

> There is also a PLT memset in libc_pic.a
>
>  1bc:   009aa023                sw      s1,0(s5)
>           memset (result->__data, '\0',
>  1c0:   865e                    mv      a2,s7
>  1c2:   4581                    li      a1,0
>  1c4:   008a8513                addi    a0,s5,8
>  1c8:   00000097                auipc   ra,0x0
>                         1c8: R_RISCV_CALL_PLT   __GI_memset
>                         1c8: R_RISCV_RELAX      *ABS*
>  1cc:   000080e7                jalr    ra # 1c8 <.LVL39+0x14>

That's weird.  What does a direct call (to a hidden symbol) look like,
relocation-wise.

Thanks,
Florian