pgsql: Include libpq/pqcomm.h to ensure we have correct knowledge of

Log Message:
-----------
Include libpq/pqcomm.h to ensure we have correct knowledge of
HAVE_STRUCT_SOCKADDR_STORAGE_SS_LEN. Per results of pgcheckdefines.

Modified Files:
--------------
pgsql/src/port:
getaddrinfo.c (r1.24 -> r1.25)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/port/getaddrinfo.c.diff?r1=1.24&r2=1.25)