Fix win32 building with C99 mode

Fix win32 building with C99 mode

In -std=c99 mode, WIN32 is not defined to be "1" anymore, but just
"#define WIN32" - so the "#if WIN32" breaks, needs to be "#ifdef WIN32"

v2: also fix block_dns.c (include config.h + compat.h)  (Selva Nair)

Signed-off-by: Gert Doering <gert@greenie.muc.de>
Acked-by: Selva Nair <selva.nair@gmail.com>
Message-Id: <20160918121423.52139-1-gert@greenie.muc.de>
URL: http://www.mail-archive.com/search?l=mid&q=20160918121423.52139-1-gert@greenie.muc.de
Signed-off-by: Gert Doering <gert@greenie.muc.de>