pgsql-server: Cleanup for Win32 pgkill.

Log Message:
-----------
Cleanup for Win32 pgkill.

Modified Files:
--------------
pgsql-server/src/backend/port/win32:
signal.c (r1.2 -> r1.3)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/port/win32/signal.c.diff?r1=1.2&r2=1.3)
pgsql-server/src/include:
port.h (r1.38 -> r1.39)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/include/port.h.diff?r1=1.38&r2=1.39)
pgsql-server/src/include/port:
win32.h (r1.24 -> r1.25)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/include/port/win32.h.diff?r1=1.24&r2=1.25)