pgsql: Fix Win32 problems with signals and sockets, by making the

Log Message:
-----------
Fix Win32 problems with signals and sockets, by making the forkexec code
even uglier than it was already :-(.  Also, on Windows only, use temporary
shared memory segments instead of ordinary files to pass over critical
variable values from postmaster to child processes.  Magnus Hagander

Modified Files:
--------------
    pgsql/src/backend/main:
        main.c (r1.92 -> r1.93)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/main/main.c.diff?r1=1.92&r2=1.93)
    pgsql/src/backend/port/win32:
        signal.c (r1.9 -> r1.10)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/port/win32/signal.c.diff?r1=1.9&r2=1.10)
    pgsql/src/backend/postmaster:
        pgstat.c (r1.84 -> r1.85)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/postmaster/pgstat.c.diff?r1=1.84&r2=1.85)
        postmaster.c (r1.438 -> r1.439)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/postmaster/postmaster.c.diff?r1=1.438&r2=1.439)
    pgsql/src/include/port:
        win32.h (r1.39 -> r1.40)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/port/win32.h.diff?r1=1.39&r2=1.40)