Fixes #32 set stderr non-blocking

Syslog seems to block entering in screen copymode... verbose mode drops
messages allowing pyfcgi to continue.

README

 	$ ./configure
 	$ make
 	# To run foo_pep333.entrypoint() PEP333 application
-	$ ./src/pyfcgi -l '127.0.0.1:9000' -S -e foo_pep333 -E entrypoint
+	$ ./src/pyfcgi -l '127.0.0.1:9000' -v -e foo_pep333 -E entrypoint
 or
 	# To run foo.entrypoint() sending to FCGI python stdout
-	$ ./src/pyfcgi -l '127.0.0.1:9000' -S -e foo -E entrypoint -A
+	$ ./src/pyfcgi -l '127.0.0.1:9000' -v -e foo -E entrypoint -A
 
 
 configure script determine python flags, libs & includes paths using

src/logger.c

 
 int pyfcgi_logger_open(pyfcgi_logger_t *logger)
 {
+	int flags;
 	if(!logger->filename)
 	{
 		logger->fd = 2;
+		flags = fcntl(logger->fd, F_GETFL);
+		if(flags == -1)
+		{
+			pyfcgi_log(LOG_ERR,
+				"Unable to GETFL on stderr",
+				strerror(errno));
+			return PYFCGI_ERR;
+		}
+		flags |= O_NONBLOCK;
+		if(fcntl(logger->fd, F_SETFL, flags) == -1)
+		{
+			pyfcgi_log(LOG_ERR,
+				"Unable to SETFL on stderr",
+				strerror(errno));
+			return PYFCGI_ERR;
+		}
 		return 0;
 	}