EXEC_ELF64 is used for NetBSD/sparc64, and EXEC_ELF32 is used for NetBSD/sparc_elf.
We really need a way to turn these on and off depending on whether we're building
a 32-bit or 64-bit kernel...
- clean up the Makefile a bit to be less solaris-centric :)
- add support for compat_sparc32 (32bit compat module for NetBSD/sparc). this
isn't yet fully tested but it mostly written and compiles if not totally
links yet.