kboot: Remove RELOC defines, it's unused

This was copied from powerpc/ofw and has never been used. We also don't
care about -DAIM. It's only relevant for in-kernel structures, which we
don't use in this userland program.

Sponsored by:		Netflix

stand/kboot/arch/amd64/Makefile.inc

@@ -1,8 +1,5 @@
 SRCS+=		conf.c host_syscall.S amd64_tramp.S elf64_freebsd.c
 
 CFLAGS+=	-I${SYSDIR}/contrib/dev/acpica/include
-# load address. set in linker script
-RELOC?=		0x0
-CFLAGS+=	-DRELOC=${RELOC}
 
 LDFLAGS=	-nostdlib -static -T ${.CURDIR}/arch/${MACHINE_ARCH}/ldscript.amd64

stand/kboot/arch/powerpc64/Makefile.inc

@@ -3,12 +3,6 @@ CFLAGS+=	-mcpu=powerpc64
 SRCS+=		conf.c ppc64_elf_freebsd.c host_syscall.S kerneltramp.S
 SRCS+=		ucmpdi2.c
 
-# load address. set in linker script
-RELOC?=		0x0
-CFLAGS+=	-DRELOC=${RELOC}
-
 LDFLAGS=	-nostdlib -static -T ${.CURDIR}/arch/${MACHINE_ARCH}/ldscript.powerpc
 
 MK_PIE=		no
-# Maybe bogus?
-CFLAGS+=	 -DAIM