Fixes for multi-architecture compilation #12
Description
The current code depends on one of FERMI_ARCH, KEPLER_ARCH, ... being defined
Line 27 in 7a97b45
but if the core is build with support for multiple architectures then none of these will be defined:
https://github.com/nv-legate/legate.core/blob/branch-22.01/src/legate.mk#L90