Remove use of deprecated ustat interface in glibc 2.28:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85835

Taken from upstream:

https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=260684

diff --git a/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc b/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc
index 858bb2184505..de18e56d11cf 100644
--- a/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc
+++ b/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc
@@ -157,7 +157,6 @@ typedef struct user_fpregs elf_fpregset_t;
 # include <sys/procfs.h>
 #endif
 #include <sys/user.h>
-#include <sys/ustat.h>
 #include <linux/cyclades.h>
 #include <linux/if_eql.h>
 #include <linux/if_plip.h>
@@ -250,7 +249,19 @@ namespace __sanitizer {
 #endif // SANITIZER_LINUX || SANITIZER_FREEBSD
 
 #if SANITIZER_LINUX && !SANITIZER_ANDROID
-  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;
   unsigned struct_rlimit64_sz = sizeof(struct rlimit64);
   unsigned struct_statvfs64_sz = sizeof(struct statvfs64);
 #endif // SANITIZER_LINUX && !SANITIZER_ANDROID
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<div class='path'>path: <a href='/guix/log/?id=8ee3e4d9e9cd991ece0cb591ff10c223aa154866'>root</a>/<a href='/guix/log/po?id=8ee3e4d9e9cd991ece0cb591ff10c223aa154866'>po</a>/<a href='/guix/log/po/packages?id=8ee3e4d9e9cd991ece0cb591ff10c223aa154866'>packages</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/po/packages?id=8ee3e4d9e9cd991ece0cb591ff10c223aa154866&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-04-14 13:01:58 +0200'>2020-04-14</span></td><td><a href='/guix/commit/po/packages?id=2b2921937017bf4b3c7c8be2d0448f8c64d02bb1'>nls: Update.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-04-12 00:18:05 +0200'>2020-04-12</span></td><td><a href='/guix/commit/po/packages?id=935ef44b398353b5b6af94e185d7b0c3d833db0b'>nls: Update.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-03-23 00:06:58 +0100'>2020-03-23</span></td><td><a href='/guix/commit/po/packages?id=86603d8660e42a3b5d8b407e456a98429943bc7e'>nls: Update.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-05-13 22:44:22 +0200'>2019-05-13</span></td><td><a href='/guix/commit/po/packages?id=d1b18fbb5c119f16d57d08ac4264e10a0a536884'>nls: Update 'fr' translation.</a></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2019-05-03 17:47:30 +0200'>2019-05-03</span></td><td><a href='/guix/commit/po/packages?id=adb5506b2cfb47f696d66a03ede897e9bfa829bb'>nls: Update da translations.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-05-01 10:49:52 +0200'>2019-05-01</span></td><td><a href='/guix/commit/po/packages?id=20ee8883bcb1d75e8e783de5254e11e7142c1e61'>nls: Update translations for de and fr.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-04-25 18:55:12 +0200'>2019-04-25</span></td><td><a href='/guix/commit/po/packages?id=57e2b24dc03e44e4e379436e63d29231f1f9d28c'>nls: Update 'es' translation.</a></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2019-04-25 18:54:46 +0200'>2019-04-25</span></td><td><a href='/guix/commit/po/packages?id=518acc73c11d0fc4118bd4f4f9220fe745d59054'>nls: Update 'fr' translation.</a></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2019-04-13 14:50:46 +0200'>2019-04-13</span></td><td><a href='/guix/commit/po/packages?id=a27ed8fd35ce66520bc3d81dbe752841583d1482'>nls: Update 'fr' translation.</a></td><td>Julien Lepiller</td></tr>