x11-toolkits/swt: update to 4.21
- Sync patches with eclipse 4.21
- Remove patch-org_eclipse_swt_graphics_Device.java (which breaks icons in Eclipse) and install missing *.css files
- Add patch-org_eclipse_swt_widgets_Shell.java to fix layout on HiDPI scaled to 200%
PR: 264512 (based on)
Submmitted by: huanghwh@gmail.com