fix mingw build failure

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Stefan Weil <sw@weilnetz.de>
Reviewed-by: Daniel P. Berrange <berrange@redhat.com>
Message-id: 20170516052439.16214-1-kraxel@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

crypto/random-platform.c

@@ -23,7 +23,7 @@
 #include "crypto/random.h"
 
 #ifdef _WIN32
-#include <Wincrypt.h>
+#include <wincrypt.h>
 static HCRYPTPROV hCryptProv;
 #else
 static int fd; /* a file handle to either /dev/urandom or /dev/random */