include: move ALLPERMS definition to compat.h

[petrutlucian94]

The Windows CI job started to fail as some libcephfs tests that use
ALLPERMS have been moved [1] to a separate file which doesn't have
the ALLPERMS definition.

/ceph/src/test/libcephfs/suidsgid.cc:240:36: error: ‘ALLPERMS’ was not declared in this scope
240 |   ASSERT_EQ(stx.stx_mode & (mode_t)ALLPERMS, before_mode);

We'll move this definition to compat.h so that we won't have to
redefine it in each file that uses it.

Note that we're moving the Windows "fs_compat.h" include up,
ensuring that the constants used by ALLPERMS are defined.

[1] 254eeb2

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