[mod_extforward] compile on OSX

define MSG_DONTWAIT and MSG_NOSIGNAL to be no-ops on platforms
without support.  (fd should already be configured O_NONBLOCK
and SIGPIPE signal is configured to be ignored)

(thx avij and wardw)

src/Makefile.am

@@ -74,6 +74,7 @@ common_src=base64.c buffer.c log.c \
 	http_auth.c \
 	http_vhostdb.c \
 	rand.c \
+	request.c \
 	splaytree.c status_counter.c \
 	safe_memclear.c
 
@@ -83,7 +84,7 @@ src = server.c response.c connections.c network.c \
 	network_freebsd_sendfile.c network_writev.c \
 	network_solaris_sendfilev.c \
 	network_darwin_sendfile.c \
-	configfile.c configparser.c request.c proc_open.c
+	configfile.c configparser.c proc_open.c
 
 lib_LTLIBRARIES =
 

src/mod_extforward.c

@@ -1277,10 +1277,10 @@ indicating which element is present :
 
 
 #ifndef MSG_DONTWAIT
-#define MSG_DONTWAIT
+#define MSG_DONTWAIT 0
 #endif
 #ifndef MSG_NOSIGNAL
-#define MSG_NOSIGNAL
+#define MSG_NOSIGNAL 0
 #endif
 
 /* returns 0 if needs to poll, <0 upon error or >0 is protocol vers (success) */