Define ssize_t on Windows

Author: k0ekk0ek

src/parser.c

@@ -20,6 +20,10 @@
 #include "log.h"
 #include "visit.h"
 
+#if _WIN32
+typedef SSIZE_T ssize_t;
+#endif
+
 zone_nonnull((1,2,3,4))
 static zone_really_inline ssize_t check_bytes(
   zone_parser_t *parser,