devel/sdl12: improve joystick support

1. Update BSD driver:
2. do not use uhid devices like keyboard as joystick
3. add env SDL_JOYSTICK_DEVICE variable handle
4. some small improvements: set verbose names, code formatting

2. Add option to compile with linux driver.

PR: 231370
Submitted by: Ivan Rozhuk <rozhuk.im@gmail.com>
Approved by: amdmi3 (maintainer timeout, 3 weeks)