Put back __osf__ support for gethostbyname_r(); the real bug was that
it was being used even without threads. This of course might be an
all-platform problem so now we only use the _r variant when we are
using threads.
diff --git a/Modules/socketmodule.c b/Modules/socketmodule.c
index 039023f..4507eaa 100644
--- a/Modules/socketmodule.c
+++ b/Modules/socketmodule.c
@@ -91,8 +91,12 @@
#undef HAVE_GETHOSTBYNAME_R_5_ARG
#undef HAVE_GETHOSTBYNAME_R_6_ARG
+#ifndef WITH_THREAD
+#undef HAVE_GETHOSTBYNAME_R
+#endif
+
#ifdef HAVE_GETHOSTBYNAME_R
-#if defined(_AIX)
+#if defined(_AIX) || defined(__osf__)
#define HAVE_GETHOSTBYNAME_R_3_ARG
#elif defined(__sun__) || defined(__sgi)
#define HAVE_GETHOSTBYNAME_R_5_ARG