archive.h is a system header, use the right #include syntax

should fix MSVC build error:
ver.cpp(29): fatal error C1083: Cannot open include file: 'archive.h': No such file or directory

src/sbbs3/ver.cpp

@@ -26,7 +26,7 @@
 #include "git_hash.h"
 #include "git_branch.h"
 #include "ver.h"
-#include "archive.h"
+#include <archive.h>
 
 #ifdef __cplusplus
 extern "C" {