installation error on postgres

when installing on postgres, you get an error when the country table is being built, saying that you're violating a "NOT NULL" constraint for "cid".

The solution is to change job_posting.install.

change:
db_query("INSERT INTO {job_posting_country} (cid, name) VALUES

to
db_query("INSERT INTO {job_posting_country} (name) VALUES

and then remove the NULL on each country list, so:

(NULL, 'Afghanistan'),

becomes

('Afghanistan'),

I eyeballed it and this fix should work on MySQL as well.