Don't use deprecated Corrade functionality.

src/Magnum/Platform/AbstractXApplication.cpp

@@ -25,7 +25,7 @@
 
 #include "AbstractXApplication.h"
 
-#include <Corrade/Utility/utilities.h>
+#include <Corrade/Utility/System.h>
 
 #include "Magnum/Platform/Context.h"
 #include "Magnum/Version.h"
@@ -162,7 +162,7 @@ int AbstractXApplication::exec() {
         if(_flags & Flag::Redraw) {
             _flags &= ~Flag::Redraw;
             drawEvent();
-        } else Utility::sleep(5);
+        } else Utility::System::sleep(5);
     }
 
     return 0;

src/Magnum/Timeline.cpp

@@ -26,7 +26,7 @@
 #include "Timeline.h"
 
 #include <Corrade/Utility/Debug.h>
-#include <Corrade/Utility/utilities.h>
+#include <Corrade/Utility/System.h>
 
 #include "Magnum/Magnum.h"
 
@@ -57,7 +57,7 @@ void Timeline::nextFrame() {
 
     #ifdef MAGNUM_BUILD_DEPRECATED
     if(_previousFrameDuration < _minimalFrameTime) {
-        Utility::sleep(std::size_t(_minimalFrameTime*1000) - duration/1000);
+        Utility::System::sleep(std::size_t(_minimalFrameTime*1000) - duration/1000);
         now = high_resolution_clock::now();
         _previousFrameDuration = duration_cast<microseconds>(now-_previousFrameTime).count()/1e6f;
     }