Reinstate struct_stat definition that got lost in previous commit.

lib/setup.h

@@ -298,6 +298,9 @@
 #  define struct_stat                struct _stat
 #endif
 
+#ifndef struct_stat
+#  define struct_stat struct stat
+#endif
 
 /* Below we define some functions. They should
    1. close a socket

src/main.c

@@ -238,6 +238,10 @@ typedef enum {
 #  define struct_stat                struct _stat
 #endif
 
+#ifndef struct_stat
+#  define struct_stat struct stat
+#endif
+
 #ifdef CURL_DOES_CONVERSIONS
 #ifdef HAVE_ICONV
 iconv_t inbound_cd  = (iconv_t)-1;