Remove use of deprecated ustat interface in glibc 2.28:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85835

Adapted to GCC 4 series from this upstream patch:
https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=260684

--- a/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc
+++ b/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc
@@ -81,7 +81,6 @@
 #include <sys/statvfs.h>
 #include <sys/timex.h>
 #include <sys/user.h>
-#include <sys/ustat.h>
 #include <linux/cyclades.h>
 #include <linux/if_eql.h>
 #include <linux/if_plip.h>
@@ -163,7 +162,19 @@
   unsigned struct_old_utsname_sz = sizeof(struct old_utsname);
   unsigned struct_oldold_utsname_sz = sizeof(struct oldold_utsname);
   unsigned struct_itimerspec_sz = sizeof(struct itimerspec);
-  unsigned struct_ustat_sz = sizeof(struct ustat);
+  // Use pre-computed size of struct ustat to avoid <sys/ustat.h> which
+  // has been removed from glibc 2.28.
+#if defined(__aarch64__) || defined(__s390x__) || defined (__mips64) \
+  || defined(__powerpc64__) || defined(__arch64__) || defined(__sparcv9) \
+  || defined(__x86_64__)
+#define SIZEOF_STRUCT_USTAT 32
+#elif defined(__arm__) || defined(__i386__) || defined(__mips__) \
+  || defined(__powerpc__) || defined(__s390__)
+#define SIZEOF_STRUCT_USTAT 20
+#else
+#error Unknown size of struct ustat
+#endif
+  unsigned struct_ustat_sz = SIZEOF_STRUCT_USTAT;
 #endif // SANITIZER_LINUX
 
 #if SANITIZER_LINUX && !SANITIZER_ANDROID
8d929b35d2c5c'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/tests/guix-daemon.sh'>
<input type='hidden' name='id' value='f3359f93f6326b79c6edb6759e68d929b35d2c5c'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=f3359f93f6326b79c6edb6759e68d929b35d2c5c'>root</a>/<a href='/guix/log/tests?id=f3359f93f6326b79c6edb6759e68d929b35d2c5c'>tests</a>/<a href='/guix/log/tests/guix-daemon.sh?id=f3359f93f6326b79c6edb6759e68d929b35d2c5c'>guix-daemon.sh</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/tests/guix-daemon.sh?id=f3359f93f6326b79c6edb6759e68d929b35d2c5c&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>