Bump up to version 1.9.0

Merge pull request libretro#10875 from hhromic/add-state-slot-icon

(Ozone) Add missing icon for 'State Slot' option in Quick Menu

Update CHANGES.md

Update RetroArch_iOS9-Info.plist

Update CHANGES.md

Merge pull request libretro#10311 from altiereslima/master

Update Portuguese Brazilian Translation

Merge pull request libretro#10012 from orbea/c99

qb: Improve the gnu99 compiler check.

Update AndroidManifest.xml

Update .travis.yml

Bump up to 1.8.1