Fail to build on Linux Arm 32bit

[marcos69]

Using Swift3.11 on a RPI3 with Raspbian stretch and cheating on the sdl2.pc file (issue #32 ).
The build of the master branch, fails:

Compile Swift Module 'Cacao' (66 sources) /home/pi/Swift-trying/Cacao/Sources/Cacao/UIControl.swift:217:66: error: integer literal '4026531840' overflows when stored into 'Int' public static let systemReserved = UIControlEvents(rawValue: 0xF0000000) ^ /home/pi/Swift-trying/Cacao/Sources/Cacao/UIControl.swift:218:61: error: integer literal '4294967295' overflows when stored into 'Int' public static let allEvents = UIControlEvents(rawValue: 0xFFFFFFFF) ^ /home/pi/Swift-trying/Cacao/Sources/Cacao/UIScrollView.swift:425:34: warning: will never be executed isDecelerating = true ^ /home/pi/Swift-trying/Cacao/Sources/Cacao/UIScrollView.swift:420:51: note: condition always evaluates to false if /* decelerationAnimation != nil */ false { ^ /home/pi/Swift-trying/Cacao/Sources/Cacao/SDL.swift:61:9: warning: initialization of immutable value 'runloop' was never used; consider replacing with assignment to '_' or removing it let runloop = RunLoop.current ~~~~^~~~~~~ _ <unknown>:0: error: build had 1 command failures

building the develop-branch fails, because of error: use of undeclared type 'UndoManager'
building V0.51 fails too, but I only got error: unsatisfiable