[coreboot-gerrit] Change in coreboot[master]: util/inteltool: Fix building with musl libc

[Evgeny Zinoviev (Code Review)]

Attention is currently required from: Stefan Reinauer.
Evgeny Zinoviev has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/50412 )

Change subject: util/inteltool: Fix building with musl libc
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Patch Set 1:

(1 comment)

File util/inteltool/inteltool.h:

https://review.coreboot.org/c/coreboot/+/50412/comment/57fc087a_2f9bb092 
PS1, Line 7: #if defined(__linux__)
           : #include <linux/stddef.h>
           : #endif
> I can't see that used anywhere in the code base, nor does it seem to be relevant for musl?

```
In file included from inteltool.h:11,
                 from inteltool.c:13:
/home/ch1p_/coreboot/src/arch/x86/include/arch/mmio.h:8:8: error: unknown type name '__always_inline'
    8 | static __always_inline uint8_t read8(const volatile void *addr)
      |        ^~~~~~~~~~~~~~~
```