games/brutalchess: Fix correupted files by dos2unix

Some files will not load properly due to ASCII conversion corruption.

While here, fix other issues including patch format, USES_GL and general
formatting.

PR: 271303
Reported by: ntspam2@netscape.net
Approved by: gustau.perez@gmail.com (maintainer, timeout > 2 weeks)
MFH: 2023Q2 (runtime fix)