databases/grass7: Fix build on aarch64 and update to 7.8.3
- update to 7.8.3
- add patches to remove some noise from ctype
- fix build on aarch64 (only r.terraflow module is problematic on aarch64)
Reported by: mikael (aarch64)
Approved by: tcberner (mentor), mikael (aarch64)
Differential Revision: https://reviews.freebsd.org/D25331