docs: clarify that gcc-4.7 is required for Android builds
Remove unset but used variable
[jenkins] - our minimum deployment target for ios is 4.2 not 4.1
cosmetics: remove unused old code from CGUIWindowSettingsCategory
[docs] - exchange libshairport with libshairplay in the linux readme
Merge pull request #2702 from Rawk/remove_unset_but_used

Remove unset but used variable