Only use the filename part of the kernel configuration file as an argument to

KERNCONF after the file has been copied to the sys/${ARCH}/conf directory. This
allows the use of one kernel config file for multiple images. E.g.:

	NANO_KERNEL=../../../../software/nanobsd/default/SOEKRIS

MFC: after 6.2

tools/tools/nanobsd/nanobsd.sh

@@ -154,7 +154,7 @@ build_kernel ( ) (
 
 	cd ${NANO_SRC}
 	${NANO_PMAKE} buildkernel \
-		__MAKE_CONF=${NANO_MAKE_CONF} KERNCONF=${NANO_KERNEL} \
+		__MAKE_CONF=${NANO_MAKE_CONF} KERNCONF=`basename ${NANO_KERNEL}` \
 		> ${MAKEOBJDIRPREFIX}/_.bk 2>&1
 )