pgsql: Added missing $Header$ entries.

Log Message:
-----------
Added missing $Header$ entries.

Modified Files:
--------------
    pgsql/src/interfaces/ecpg/pgtypeslib:
        common.c (r1.12 -> r1.13)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/pgtypeslib/common.c.diff?r1=1.12&r2=1.13)
    pgsql/src/interfaces/ecpg/preproc:
        c_keywords.c (r1.17 -> r1.18)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/preproc/c_keywords.c.diff?r1=1.17&r2=1.18)
        type.c (r1.67 -> r1.68)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/preproc/type.c.diff?r1=1.67&r2=1.68)
        variable.c (r1.39 -> r1.40)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/preproc/variable.c.diff?r1=1.39&r2=1.40)