First part of the connection_status work. No user-callable functions

yet.  That is coming next.  Have also only done Apache and CGI so far.
Will have to crack open my ISAPI book to do that one.

Also changed the SAPI output functions to return an int.  We'll check
the connection status inside each one, but we might need the return
code at some other level and I don't see a good reason for just tossing
these return codes.

main/php.h

@@ -324,6 +324,10 @@ PHPAPI int cfg_get_string(char *varname, char **result);
 #include "zend_variables.h"
 #include "zend_constants.h"
 
+/* connection status states */
+#define PHP_CONNECTION_NORMAL  0
+#define PHP_CONNECTION_ABORTED 1
+#define PHP_CONNECTION_TIMEOUT 2
 
 
 /* Finding offsets of elements within structures.