std.Target: Remove `spir`/`spir64` architecture tags.

These were for very old OpenCL have been long abandoned in favor of SPIR-V.

* https://github.com/KhronosGroup/SPIR
* https://github.com/KhronosGroup/SPIR-Tools
1e9278d718Alex Rønne Petersen committed on 7/30/2024, 4:30:25 AMparent38e0f04
6 files changedLine totals unavailable