copy-builtin: make sure kernel Makefiles don't look in zfs source tree

The icp Makefile was referencing absolute paths to the zfs source tree for
include files.  The result was that even though the headers get added to
the Linux kernel tree, building fails if you move/remove the zfs checkout.

Signed-off-by: Michael D Labriola <[email protected]>

Author: veggiemike

copy-builtin

@@ -42,6 +42,7 @@ for MODULE in "${MODULES[@]}"
 do
 	sed -i '/obj =/d' "$KERNEL_DIR/fs/zfs/$MODULE/Makefile"
 	sed -i '/src =/d' "$KERNEL_DIR/fs/zfs/$MODULE/Makefile"
+	sed -i "s|-I$PWD/module/|-I\$(srctree)/fs/zfs/|" "$KERNEL_DIR/fs/zfs/$MODULE/Makefile"
 done
 
 cat > "$KERNEL_DIR/fs/zfs/Kconfig" <<"EOF"