[patch] fix libsanitizer build on sparc64 (32bit multilib)

[Matthias Klose]

The fix for PR85835 causes the build to fail on sparc64-linux-gnu in the 32bit
multilib.  Testing the attached patch in a multilib enabled sparc64 cross build.
 Ok for the trunk and branches if the build succeeds?

Matthias

2018-05-31  Matthias Klose  <doko@ubuntu.com>

        PR sanitizer/86012
        * sanitizer_common/sanitizer_platform_limits_posix.cc: Define
        SIZEOF_STRUCT_USTAT for 32bit sparc.

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