pgsql: Stamp releases 7.3.15, 7.4.13, and 8.0.8.

Log Message:
-----------
Stamp releases 7.3.15, 7.4.13, and 8.0.8.

Tags:
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REL7_4_STABLE

Modified Files:
--------------
    pgsql/doc:
        FAQ (r1.238.2.5 -> r1.238.2.6)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/FAQ.diff?r1=1.238.2.5&r2=1.238.2.6)
        bug.template (r1.21.6.14 -> r1.21.6.15)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/bug.template.diff?r1=1.21.6.14&r2=1.21.6.15)
    pgsql/doc/src/FAQ:
        FAQ.html (r1.195.2.6 -> r1.195.2.7)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/FAQ/FAQ.html.diff?r1=1.195.2.6&r2=1.195.2.7)
    pgsql/src/include:
        pg_config.h.win32 (r1.11.4.13 -> r1.11.4.14)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/pg_config.h.win32.diff?r1=1.11.4.13&r2=1.11.4.14)
    pgsql/src/interfaces/libpq:
        libpq.rc (r1.10.4.12 -> r1.10.4.13)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/libpq/libpq.rc.diff?r1=1.10.4.12&r2=1.10.4.13)