Fix portability problems with glibc 2.0, as reported in #449157.

Modules/_localemodule.c

@@ -527,6 +527,8 @@ init_locale(void)
     ADDINT(ABMON_11);
     ADDINT(ABMON_12);
 
+#ifdef RADIXCHAR
+    /* The following are not available with glibc 2.0 */
     ADDINT(RADIXCHAR);
     ADDINT(THOUSEP);
     /* YESSTR and NOSTR are deprecated in glibc, since they are
@@ -537,6 +539,7 @@ init_locale(void)
     ADDINT(NOSTR);
     */
     ADDINT(CRNCYSTR);
+#endif
 
     ADDINT(D_T_FMT);
     ADDINT(D_FMT);

Modules/addrinfo.h

@@ -67,6 +67,10 @@
 #define	AI_DEFAULT	(AI_V4MAPPED_CFG | AI_ADDRCONFIG)
 #endif
 
+#endif /* HAVE_GETADDRINFO */
+
+#ifndef HAVE_GETNAMEINFO
+
 /*
  * Constants for getnameinfo()
  */
@@ -86,6 +90,8 @@
 #define	NI_DGRAM	0x00000010
 #endif
 
+#endif /* HAVE_GETNAMEINFO */
+
 #ifndef HAVE_ADDRINFO
 struct addrinfo {
 	int	ai_flags;	/* AI_PASSIVE, AI_CANONNAME */
@@ -137,4 +143,3 @@ extern void freehostent Py_PROTO((struct hostent *));
 #ifdef __cplusplus
 }
 #endif
-#endif

Modules/getnameinfo.c

@@ -81,6 +81,10 @@ struct gni_sockinet {
 #define ENI_FAMILY	5
 #define ENI_SALEN	6
 
+/* forward declaration to make gcc happy */
+int getnameinfo Py_PROTO((const struct sockaddr *, size_t, char *, size_t,
+			  char *, size_t, int));
+
 int
 getnameinfo(sa, salen, host, hostlen, serv, servlen, flags)
 	const struct sockaddr *sa;

Modules/socketmodule.c

@@ -447,7 +447,11 @@ PyGAI_Err(int error)
 	if (error == EAI_SYSTEM)
 		return PySocket_Err();
 
+#ifdef HAVE_GAI_STRERROR
 	v = Py_BuildValue("(is)", error, gai_strerror(error));
+#else
+	v = Py_BuildValue("(is)", error, "getaddrinfo failed");
+#endif
 	if (v != NULL) {
 		PyErr_SetObject(PyGAI_Error, v);
 		Py_DECREF(v);