Remove backwards compat layer which was added in r71419 (in 2001).

This change is not intended for MFC.

Reviewed by:	peter

Makefile.inc1

@@ -892,16 +892,11 @@ NO_KERNELOBJ=		t
 KERNCONF=${KERNFAST}
 .endif
 .endif
-.if !defined(KERNCONF) && defined(KERNEL)
-KERNCONF=	${KERNEL}
-KERNWARN=
-.else
 .if ${TARGET_ARCH} == "powerpc64"
 KERNCONF?=	GENERIC64
 .else
 KERNCONF?=	GENERIC
 .endif
-.endif
 INSTKERNNAME?=	kernel
 
 KERNSRCDIR?=	${.CURDIR}/sys
@@ -929,12 +924,6 @@ buildkernel:
 .if empty(BUILDKERNELS)
 	@echo "ERROR: Missing kernel configuration file(s) (${KERNCONF})."; \
 	false
-.endif
-.if defined(KERNWARN)
-	@echo "--------------------------------------------------------------"
-	@echo ">>> WARNING: KERNEL= setting should be changed to KERNCONF="
-	@echo "--------------------------------------------------------------"
-	@sleep 3
 .endif
 	@echo
 .for _kernel in ${BUILDKERNELS}