make razor_set_update not loop forever on unsatisfiable dependencies

this is mostly a dead-end, as to get the next test working i need to
rewrite the code as suggested in the comment above razor_set_revalidate

 .gitignore

 *.o

 *~

 *.repo

 razor

 test-driver

 pkgs

 set

 primary.xml.gz

 filelists.xml.gz