set KDIR early if called from dkms and get version from sources

Author: anbe42

configure

@@ -7,6 +7,7 @@ KDKMS=
 case "$1" in
   --from-dkms-conf*)
     KDKMS=`echo "$1" | sed 's/[^=]*.//'`
+    KDIR="$KDKMS"
     # restore options from existing Makefile, if present
     if [ -e Makefile ]; then
       set -- `sed -n 's/^CARGS = \(.*\)/\1/p' Makefile`