lang/v8-beta: update to 15.6.75.8 (Chrome 156 beta)
Rebuild the port on top of lang/v8 and follow the Chrome Linux beta
channel again. Compared to lang/v8 15.5.35.20:
- Read time zone data from devel/icu through the new upstream v8_enable_temporal_systemicu option instead of a local patch.
- Port PartitionAlloc's zero segment, which keeps the low 4 GB of the address space inaccessible, to FreeBSD. Hinted mappings are not honored with ASLR, so reserve the range with a guard mapping. d8 now refuses to start when the range can not be reserved; only have it do so when ASLR is active, as position-independent executables are loaded below 4 GB otherwise.
- Drop patches for files the build does not use and the EXAMPLES leftovers.
- Take maintainership.