[PATCH] riscv: fix build with binutils 2.38

[Palmer Dabbelt]

On Fri, 01 Apr 2022 10:14:03 PDT (-0700), Linus Torvalds wrote:
> On Thu, Mar 31, 2022 at 11:53 PM Marc Kleine-Budde <mkl at pengutronix.de> wrote:
>>
>> | WARNING: invalid argument to '-march': 'zicsr_zifencei'
>
> Gaah, it works but still warns because I cut-and-pasted those
> zicsr/zifencei options from some random source that had them
> capitalized and I didn't look closely enough at the reports.
>
> Anyway, hopefully somebody can bother to fix up that. Possibly by
> changing the strncmp to a strnicmp - but I don't know what the rules
> for lower-case vs capitals are for the other options. I'm still busy
> with the kernel merge window, so this gets archived on my side..

I'm gluing sparse to my build tests now, so I'll sort it out (that'll 
also make sure a failure doesn't leak again).  Might not be today, but 
shouldn't take too long.