devel/nextpnr-himbaechel-gowin: Add nextpnr-himbaechel-gowin-0.0.20250829

Nextpnr is a portable FPGA place and route tool.  Nextpnr aims to
be a vendor neutral, timing driven, FOSS FPGA place and route tool.

This package installs the Gowin version of nextpnr-himbaechel