GBK support is too limited

Submitted by Jehan Pagès @Jehan

Assigned to Jehan Pagès @Jehan

Link to original bug (#97521)

Description

GBK support in uchardet is still too weak.

See:

• https://github.com/BYVoid/uchardet/issues/23
• https://github.com/BYVoid/uchardet/issues/31