pgsql-server: Move pgkill out into /port so pg_ctl can use it on Win32.

Log Message:
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Move pgkill out into /port so pg_ctl can use it on Win32.

Modified Files:
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pgsql-server:
configure (r1.369 -> r1.370)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/configure.diff?r1=1.369&r2=1.370)
configure.in (r1.358 -> r1.359)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/configure.in.diff?r1=1.358&r2=1.359)
pgsql-server/src/backend/port/win32:
signal.c (r1.1 -> r1.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/port/win32/signal.c.diff?r1=1.1&r2=1.2)
pgsql-server/src/include/port:
win32.h (r1.23 -> r1.24)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/include/port/win32.h.diff?r1=1.23&r2=1.24)

Added Files:
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pgsql-server/src/port:
kill.c (r1.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/port/kill.c?rev=1.1&content-type=text/x-cvsweb-markup)