restore previous KERNELDIR behavior

My patch to fix the --kerneldir option to configure caused a subtle change in behavior when --kerneldir wasn't specified. Previously, kernel/Makefile would set KERNELDIR to /lib/modules/xxx. The fix caused it to be set to $(readlink -f /lib/modules/xxx) (via config.mak). Normally this wouldn't have made any difference, a symlink and what it points to are synonymous, but various places rely on KERNELDIR being of the form /lib/modules/xxx for pattern substitution. Switch back to the old behavior.

This should fix the issue reported by Omar Khan <[email protected]> and Pelle <[email protected]>

Index: configure
===================================================================
@@ -94,7 +94,7 @@
 
 cat <<EOF > config.mak
 PREFIX=$prefix
-KERNELDIR=$(readlink -f $kerneldir)
+KERNELDIR="$kerneldir"
 WANT_MODULE=$want_module
 EOF
 

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