clock: Use system colors instead of hardcoded RGB values.

programs/clock/main.c

@@ -309,7 +309,7 @@ static VOID CLOCK_Paint(HWND hWnd)
 
     SetViewportOrgEx(dcMem, -ps.rcPaint.left, -ps.rcPaint.top, NULL);
     /* Erase the background */
-    FillRect(dcMem, &ps.rcPaint, GetStockObject(LTGRAY_BRUSH));
+    FillRect(dcMem, &ps.rcPaint, GetSysColorBrush(COLOR_3DFACE));
 
     if(Globals.bAnalog)
 	AnalogClock(dcMem, Globals.MaxX, Globals.MaxY, Globals.bSeconds, Globals.bWithoutTitle);

programs/clock/winclock.c

@@ -32,16 +32,11 @@
 #include "windows.h"
 #include "winclock.h"
 
-#define Black  RGB(0,0,0)
-#define Gray   RGB(128,128,128)
-#define LtGray RGB(192,192,192)
-#define White  RGB(255,255,255)
-
-static const COLORREF FaceColor = LtGray;
-static const COLORREF HandColor = White;
-static const COLORREF TickColor = White;
-static const COLORREF ShadowColor = Black;
-static const COLORREF BackgroundColor = LtGray;
+#define FaceColor (GetSysColor(COLOR_3DFACE))
+#define HandColor (GetSysColor(COLOR_3DHIGHLIGHT))
+#define TickColor (GetSysColor(COLOR_3DHIGHLIGHT))
+#define ShadowColor (GetSysColor(COLOR_3DDKSHADOW))
+#define BackgroundColor (GetSysColor(COLOR_3DFACE))
 
 static const int SHADOW_DEPTH = 2;