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gui-win32: fix WM_SCROLLWHEEL mouse position

the lParam for WM_SCROLLWHEEL is in *SCREEN* coordinates while
WM_MOUSEMOVE uses window coordinates, so just ignore lParam for
WM_SCROLLWHEEL and use call mousetrack() with zero delta.

--- a/gui-win32/screen.c

+++ b/gui-win32/screen.c

@@ -364,7 +364,8 @@

 			b |=8;

 		else

 			b |=16;

-		// fallthrough

+		mousetrack(0, 0, b, ticks());

+		break;

 	case WM_MOUSEMOVE:

 	case WM_LBUTTONUP:

 	case WM_MBUTTONUP:

--- a/kern/devmouse.c

+++ b/kern/devmouse.c

@@ -312,6 +312,12 @@

 }

 void

+mousetrack(int dx, int dy, int b, ulong msec)

+{

+	absmousetrack(mouse.state.xy.x + dx, mouse.state.xy.y + dy, b, msec);

+}

+

+void

 absmousetrack(int x, int y, int b, ulong msec)

 {

 	int lastb;

--- a/kern/screen.h

+++ b/kern/screen.h

@@ -56,4 +56,5 @@

 void	terminit(void);

+void	mousetrack(int, int, int, ulong);

 void	absmousetrack(int, int, int, ulong);