kbuild: Fix build number generation

For some inexplicable reason, I broke the dependency on a new build number
some time ago - it worked fine before, and now it does again.

(Whenever vmlinux is relinked, the build number is incremented, and now it
ends in the version string again, as it should)

Noted by Anton Blanchard.

scripts/mkcompile_h

@@ -67,8 +67,8 @@ UTS_TRUNCATE="sed -e s/\(.\{1,$UTS_LEN\}\).*/\1/"
 # first line.
 
 if [ -r $TARGET ] && \
-      grep -v 'auto generated\|UTS_VERSION\|LINUX_COMPILE_TIME' $TARGET > .tmpver.1 && \
-      grep -v 'auto generated\|UTS_VERSION\|LINUX_COMPILE_TIME' .tmpcompile > .tmpver.2 && \
+      grep -v 'UTS_VERSION\|LINUX_COMPILE_TIME' $TARGET > .tmpver.1 && \
+      grep -v 'UTS_VERSION\|LINUX_COMPILE_TIME' .tmpcompile > .tmpver.2 && \
       cmp -s .tmpver.1 .tmpver.2; then
    echo ' (unchanged)'
    rm -f .tmpcompile