[PATCH] LoongArch: Use medium cmodel build libc_nonshared.a.

[Florian Weimer]

> From: Chenghua Xu <xuchenghua@loongson.cn>
>
> This patch is used to fix address out-of-bounds error when building
> firefox.

The .c files shouldn't be necessary.  The CFLAGS additions should
perhaps be made subdirectory-specific.  And I think these days,
libc_nonshared.a is much, much small (and we could size it down even
further).

But shouldn't the medium model be the GCC default if it is required for
building applications?

Thanks,
Florian