Optimize drawing horizontal/vertical lines

On DC with a non-rotated coordinate system drawing a filled rectangle with ExtTextOut() Win API is faster than drawing a line with MoveTo()/LineTo() so on such DCs we can use ExtTextOut() to draw horizontal/vertical lines with solid colors and square ends instead of calling MoveTo()/LineTo().

See #18517.

include/wx/msw/private.h

@@ -1109,6 +1109,8 @@ extern WXDLLIMPEXP_CORE wxSize wxGetHiconSize(HICON hicon);
 
 WXDLLIMPEXP_CORE void wxDrawLine(HDC hdc, int x1, int y1, int x2, int y2);
 
+WXDLLIMPEXP_CORE void wxDrawHVLine(HDC hdc, int x1, int y1, int x2, int y2, COLORREF color, int width);
+
 // fill the client rect of the given window on the provided dc using this brush
 inline void wxFillRect(HWND hwnd, HDC hdc, HBRUSH hbr)
 {