FindPostgreSQL: Search some more common packaging locations

Use PATH_SUFFIXES to search more common packaging locations.

On Windows, we can use suffixes to search in the standard Program Files
locations without hard-coding the C:/ path.

On Ubuntu/Debian, starting with PostgreSQL 9.3 the header file pg_type.h
is moved to a separate package (from libpq-dev to postgresql-server-dev)
and consequently the file pg_type.h is moved to a new location:

  /usr/include/postgresql/<version>/server/catalog/pg_type.h

While at it, use separate PATH_SUFFIXES variables for library, type and
include (this is merely an optimization).