Include libssh2.h before git2.h (transport.h)

src/transports/ssh.c

@@ -5,6 +5,10 @@
  * a Linking Exception. For full terms see the included COPYING file.
  */
 
+#ifdef GIT_SSH
+#include <libssh2.h>
+#endif
+
 #include "git2.h"
 #include "buffer.h"
 #include "netops.h"
@@ -12,8 +16,6 @@
 
 #ifdef GIT_SSH
 
-#include <libssh2.h>
-
 #define OWNING_SUBTRANSPORT(s) ((ssh_subtransport *)(s)->parent.subtransport)
 
 static const char prefix_ssh[] = "ssh://";