Winsock non-blocking kludge for GnuTLS (refs #538)

extras/contrib/src/Makefile

@@ -1498,6 +1498,7 @@ gnutls-$(GNUTLS_VERSION).tar.bz2:
 
 gnutls: gnutls-$(GNUTLS_VERSION).tar.bz2
 	$(EXTRACT_BZ2)
+	patch -p0 < Patches/gnutls-win32.patch
 
 .gnutls: gnutls .gcrypt .gpg-error
 ifdef HAVE_WIN32

extras/contrib/src/Patches/gnutls-win32.patch

+--- gnutls.orig/lib/gnutls_buffers.c	2006-03-08 18:26:31.000000000 +0100
++++ gnutls/lib/gnutls_buffers.c	2006-03-08 18:25:58.000000000 +0100
+@@ -244,7 +244,11 @@
+ 	    _gnutls_read_log("READ: %d returned from %d, errno=%d\n", i,
+ 			     fd, errno);
+ 
++#ifdef _WIN32
++	    if (WSAGetLastError() == WSAEWOULDBLOCK) {
++#else
+ 	    if (errno == EAGAIN || errno == EINTR) {
++#endif
+ 		if (sizeOfPtr - left > 0) {
+ 
+ 		    _gnutls_read_log("READ: returning %d bytes from %d\n",
+@@ -635,7 +639,11 @@
+ 						     left);
+ 
+ 	if (i == -1) {
++#ifdef _WIN32
++	    if (WSAGetLastError() == WSAEWOULDBLOCK) {
++#else
+ 	    if (errno == EAGAIN || errno == EINTR) {
++#endif
+ 		session->internals.record_send_buffer_prev_size +=
+ 		    n - left;
+