Auto merge of rust-lang#1959 - JohnTitor:new-release, r=JohnTitor

Release 0.2.80

libc 0.2.79

libc 0.2.78

Merge pull request rust-lang#1879 from xonatius/0.2.77

Bump up to 0.2.77

Merge pull request rust-lang#1871 from JohnTitor/0.2.76

Bump up to 0.2.76

Merge pull request rust-lang#1866 from joshtriplett/master

libc 0.2.75

Merge pull request rust-lang#1845 from MrAwesome/patch-1

Bump version to 0.2.74

Merge pull request rust-lang#1825 from shepmaster/release

Bump to 0.2.73

Merge pull request rust-lang#1807 from qwandor-google/master

Bump version ready to import into Android tree.

Merge pull request rust-lang#1771 from jackpot51/patch-2

Bump version to 0.2.71