[RFC, hurd 64bit]: st_dev type

[Samuel Thibault]

Hello,

Since we are creating a new ABI, it's time to take care of types :)

I have fixed a few cases that had been identified on hurd 32bit, so that
hurd 64bit doesn't get affected.

There is however one case which remains problematic: stat.st_dev, which
the standars say to have type dev_t, is #defined to st_fsid on Hurd,
since the pid of the translator is what is representative of the device
number. It happens that dev_t is 32bit (__U32_TYPE) and fsid_t is
64bit (__UQUAD_TYPE), see BZ 23084. Perhaps we should just make dev_t
UWORD_TYPE, so it becomes 64bit on Hurd 64bit, as the attached patch
does? (it is UQUAD or 64bit on Linux ports)

I have only checked what is tested by the testsuite, we should
probably carefully review all types exposed by libc with hurd-specific
definitions.

Samuel

patch
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