Rollup merge of rust-lang#40317 - malbarbo:update-libc, r=alexcrichton

frewsxcv · web-flow · commit e65232187eaa · 2017-03-08T08:43:53.000-05:00
Update libc to 0.2.21

Update to include android aarch64 and x86 improvements.
diff --git a/src/liblibc b/src/liblibc
@@ -1 +1 @@
-Subproject commit 64d954c6a76e896fbf7ed5c17e77c40e388abe84
+Subproject commit 05a2d197356ef253dfd985166576619ac9b6947f
