in_sdl.c: replace uses of deprecated IOHID{Get|Set}AccelerationWithKey

Thanks to a tip found at: https://stackoverflow.com/questions/49679753

Fixes deprecation warnings from Apple compiler:

in_sdl.c:167:7: 'IOHIDGetAccelerationWithKey' is deprecated: first deprecated in macOS 10.12 [-Wdeprecated-declarations]
                if (IOHIDGetAccelerationWithKey(mouseDev, CFSTR(kIOHIDMouseAccelerationType), &originalMouseSpeed) == kIOReturnSuccess)
                    ^
in_sdl.c:169:8: 'IOHIDSetAccelerationWithKey' is deprecated: first deprecated in macOS 10.12 [-Wdeprecated-declarations]
                        if (IOHIDSetAccelerationWithKey(mouseDev, CFSTR(kIOHIDMouseAccelerationType), -1.0) != kIOReturnSuccess)
                            ^
in_sdl.c:194:7: 'IOHIDSetAccelerationWithKey' is deprecated: first deprecated in macOS 10.12 [-Wdeprecated-declarations]
                if (IOHIDSetAccelerationWithKey(mouseDev, CFSTR(kIOHIDMouseAccelerationType), originalMouseSpeed) != kIOReturnSuccess)
                    ^

Quake/in_sdl.c

@@ -136,7 +136,7 @@ static void IN_EndIgnoringMouseEvents(void)
 
 #ifdef MACOS_X_ACCELERATION_HACK
 static cvar_t in_disablemacosxmouseaccel = {"in_disablemacosxmouseaccel", "1", CVAR_ARCHIVE};
-static double originalMouseSpeed = -1.0;
+static unsigned int originalMouseSpeed = (unsigned int) (-65536);
 
 static io_connect_t IN_GetIOHandle(void)
 {
@@ -164,18 +164,20 @@ static void IN_DisableOSXMouseAccel (void)
 	io_connect_t mouseDev = IN_GetIOHandle();
 	if (mouseDev != 0)
 	{
-		if (IOHIDGetAccelerationWithKey(mouseDev, CFSTR(kIOHIDMouseAccelerationType), &originalMouseSpeed) == kIOReturnSuccess)
+		IOByteCount size;
+		if (IOHIDGetParameter(mouseDev, CFSTR(kIOHIDMouseAccelerationType), sizeof(originalMouseSpeed), &originalMouseSpeed, &size) == kIOReturnSuccess)
 		{
-			if (IOHIDSetAccelerationWithKey(mouseDev, CFSTR(kIOHIDMouseAccelerationType), -1.0) != kIOReturnSuccess)
+			unsigned int noaccel = (unsigned) (-65536);
+			if (IOHIDSetParameter(mouseDev, CFSTR(kIOHIDMouseAccelerationType), &noaccel, sizeof(noaccel)) != kIOReturnSuccess)
 			{
 				Cvar_Set("in_disablemacosxmouseaccel", "0");
-				Con_Printf("WARNING: Could not disable mouse acceleration (failed at IOHIDSetAccelerationWithKey).\n");
+				Con_Printf("WARNING: Could not disable mouse acceleration (failed at IOHIDSetParameter).\n");
 			}
 		}
 		else
 		{
 			Cvar_Set("in_disablemacosxmouseaccel", "0");
-			Con_Printf("WARNING: Could not disable mouse acceleration (failed at IOHIDGetAccelerationWithKey).\n");
+			Con_Printf("WARNING: Could not disable mouse acceleration (failed at IOHIDGetParameter).\n");
 		}
 		IOServiceClose(mouseDev);
 	}
@@ -191,15 +193,15 @@ static void IN_ReenableOSXMouseAccel (void)
 	io_connect_t mouseDev = IN_GetIOHandle();
 	if (mouseDev != 0)
 	{
-		if (IOHIDSetAccelerationWithKey(mouseDev, CFSTR(kIOHIDMouseAccelerationType), originalMouseSpeed) != kIOReturnSuccess)
-			Con_Printf("WARNING: Could not re-enable mouse acceleration (failed at IOHIDSetAccelerationWithKey).\n");
+		if (IOHIDSetParameter(mouseDev, CFSTR(kIOHIDMouseAccelerationType), &originalMouseSpeed, sizeof(originalMouseSpeed)) != kIOReturnSuccess)
+			Con_Printf("WARNING: Could not re-enable mouse acceleration (failed at IOHIDSetParameter).\n");
 		IOServiceClose(mouseDev);
 	}
 	else
 	{
 		Con_Printf("WARNING: Could not re-enable mouse acceleration (failed at IO_GetIOHandle).\n");
 	}
-	originalMouseSpeed = -1;
+	originalMouseSpeed = (unsigned)(-65536);
 }
 #endif /* MACOS_X_ACCELERATION_HACK */
 
@@ -211,7 +213,7 @@ void IN_Activate (void)
 
 #ifdef MACOS_X_ACCELERATION_HACK
 	/* Save the status of mouse acceleration */
-	if (originalMouseSpeed == -1 && in_disablemacosxmouseaccel.value)
+	if (originalMouseSpeed == (unsigned)(-65536) && in_disablemacosxmouseaccel.value)
 		IN_DisableOSXMouseAccel();
 #endif
 
@@ -257,7 +259,7 @@ void IN_Deactivate (qboolean free_cursor)
 		return;
 
 #ifdef MACOS_X_ACCELERATION_HACK
-	if (originalMouseSpeed != -1)
+	if (originalMouseSpeed != (unsigned)(-65536))
 		IN_ReenableOSXMouseAccel();
 #endif