The existing situtation of not having any explicit rules for header
files does not work because it requires a make restart after
the headers are generated in order for the headers to be delivered.

Because requiring running make twice to get a complete rebuild is bad,
add some rules to force the headers to be delivered immediately.

Change-Id: I5b4d5c8f8e9c9d7d0874fc797e62972eaa1dd904