Initial support for gambit-scheme v4.7.0

ports/glibc-compat/src/getprotobyname_r.c

Index: ports/glibc-compat/src/getprotobyname_r.c
diff --git a/ports/glibc-compat/src/getprotobyname_r.c b/ports/glibc-compat/src/getprotobyname_r.c
index 9c7253d936092003c56e5489bc6265cf19727dd8..0becf794294abf90bec1ee9e6a9f977e527d3973 100644
--- a/ports/glibc-compat/src/getprotobyname_r.c
+++ b/ports/glibc-compat/src/getprotobyname_r.c
@@ -9,6 +9,10 @@ struct protoent *getprotobyname(const char *name) {
   return NULL;
 }
 
+struct protoent *getprotobynumber(int n) {
+  return NULL;
+}
+
 int __getprotobyname_r(const char *name,
                        struct protoent *result_buf, char *buf,
                        size_t buflen, struct protoent **result)