Changed launchUrl to launchURL for Mac and iOS.

gameplay/src/PlatformMacOSX.mm

@@ -1882,7 +1882,7 @@ static void hidDeviceValueAvailableCallback(void* inContext, IOReturn inResult,
     } while (1);
 }
 
-bool Platform::launchUrl(const char *url)
+bool Platform::launchURL(const char *url)
 {
     if (url == NULL || *url == '\0')
         return false;

gameplay/src/PlatformiOS.mm

@@ -1320,7 +1320,7 @@ float Platform::getGamepadTriggerValue(unsigned int gamepadHandle, unsigned int
     return 0.0f;
 }
 
-bool Platform::launchUrl(const char *url)
+bool Platform::launchURL(const char *url)
 {
     if (url == NULL || *url == '\0')
         return false;