CMake Nightly Date Stamp
Fix FindPostgreSQL for pg_config in multilib configurations.

Some platforms, Fedora 20 and RHEL 7 in particular, will have multiple
pg_config_${arch}.h files all included by the top level pg_config.h.
This checks all of the available pg_config*.h headers for version
information.
Merge topic 'fix-findpostgres-for-multilib' into next

5e62e900 Fix FindPostgreSQL for pg_config in multilib configurations.
5d7ce7a4 CMake Nightly Date Stamp