Avoid double close of file handle in syslogger on win32

This causes an exception when running under a debugger or in particular
when running on a debug version of Windows.

Patch from MauMau

Branch
------
REL8_4_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/a863963fcdcc1d9cc3aac7e42ec696af4377cbc4

Modified Files
--------------
src/backend/postmaster/syslogger.c | 7 +++++--
1 files changed, 5 insertions(+), 2 deletions(-)


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