Fix compile warnings with win32

The buffer variable in InstallService() was not ever used.

The other warning was about windows.h being included before winsock2.h
Fix compile warnings

AUTH_FILE was declared twice when it did not need to be.
Merge pull request #136 from awiddersheim/fix_win32_compile_warnings

Fix compile warnings with win32
Merge remote-tracking branch 'upstream/master'