The fallocate syscall might fail on Linux due missing support from
underlying filesystem (for instance some NFS versions). This patch
adds this check for fallocate tests. It also moves tst-fallocate{64}
to 'io' folder (since it is on fallocate{64} is built).
Checked on x86_64.
* sysdeps/unix/sysv/linux/Makefile [$(subdir) = math] (tests): Move
tst-fallocate{64}.
* sysdeps/unix/sysv/linux/tst-fallocate-common.c: Check for EOPNOTSUPP
on syscall return.
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