- Remove ${NORMAL_C_NOWERROR}, it is not used anymore. To build

without -Werror, we do "make WERROR=", which doesn't need this
  variable.
- Use ${.IMPSRC} instead of $< in ${NORMAL_M} for consistency with
  the rest of the file.
- Add ${WERROR} for the ${NORMAL_M} case.

Tested on:	i386, sparc64

sys/conf/kern.pre.mk

@@ -57,10 +57,9 @@ CFLAGS+=	${CONF_CFLAGS}
 NORMAL_C= ${CC} -c ${CFLAGS} ${WERROR} ${PROF} ${.IMPSRC}
 NORMAL_S= ${CC} -c ${ASM_CFLAGS} ${WERROR} ${.IMPSRC}
 PROFILE_C= ${CC} -c ${CFLAGS} ${WERROR} ${.IMPSRC}
-NORMAL_C_NOWERROR= ${CC} -c ${CFLAGS} ${PROF} ${.IMPSRC}
 
-NORMAL_M= ${AWK} -f $S/tools/makeobjops.awk $< -c ; \
-	  ${CC} -c ${CFLAGS} ${PROF} ${.PREFIX}.c
+NORMAL_M= ${AWK} -f $S/tools/makeobjops.awk ${.IMPSRC} -c ; \
+	  ${CC} -c ${CFLAGS} ${WERROR} ${PROF} ${.PREFIX}.c
 
 GEN_CFILES= $S/$M/$M/genassym.c
 SYSTEM_CFILES= vnode_if.c hints.c env.c config.c