Revert "Revert "Revert "FROMLIST: kheaders: Follow symlinks to source files."""

This reverts commit 81ce9a43.

Reason for revert: Increased image size by too much. Plus, it does not strip out comments properly.

Bug: 276339429
Change-Id: I083a4aa9d39bca5b6448e4b87df8616c198cf018
Signed-off-by: Yifan Hong <elsk@google.com>