mingw: wrap SSL_set_(w|r)fd to call _get_osfhandle

SSL_set_fd (and friends) expects a OS file handle on Windows, not
a file descriptor as on UNIX(-ish).

This patch makes the Windows version of SSL_set_fd behave like the
UNIX versions, by calling _get_osfhandle on it's input.

Signed-off-by: Erik Faye-Lund <kusmabite@gmail.com>
Acked-by: Johannes Sixt <j6t@kdbg.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

compat/mingw.h

@@ -124,6 +124,27 @@ static inline int waitpid(pid_t pid, int *status, unsigned options)
 	return -1;
 }
 
+#ifndef NO_OPENSSL
+#include <openssl/ssl.h>
+static inline int mingw_SSL_set_fd(SSL *ssl, int fd)
+{
+	return SSL_set_fd(ssl, _get_osfhandle(fd));
+}
+#define SSL_set_fd mingw_SSL_set_fd
+
+static inline int mingw_SSL_set_rfd(SSL *ssl, int fd)
+{
+	return SSL_set_rfd(ssl, _get_osfhandle(fd));
+}
+#define SSL_set_rfd mingw_SSL_set_rfd
+
+static inline int mingw_SSL_set_wfd(SSL *ssl, int fd)
+{
+	return SSL_set_wfd(ssl, _get_osfhandle(fd));
+}
+#define SSL_set_wfd mingw_SSL_set_wfd
+#endif
+
 /*
  * implementations of missing functions
  */