ignore return value from fcntl() FD_CLOEXEC

setting or removing FD_CLOEXEC flag does not fail

Also the use in mod_fastcgi and mod_scgi is in child after fork().
If the fd already happens to be 0 (should not happen in current code)
and removing the FD_CLOEXEC flag fails, then the backend will fail
to start.

src/mod_fastcgi.c

@@ -1065,7 +1065,7 @@ static int fcgi_spawn_connection(server *srv,
 			}
 		      #ifdef SOCK_CLOEXEC
 			else
-				fcntl(fcgi_fd, F_SETFD, 0); /* clear cloexec */
+				(void)fcntl(fcgi_fd, F_SETFD, 0); /* clear cloexec */
 		      #endif
 
 			/* we don't need the client socket */

src/mod_scgi.c

@@ -829,7 +829,7 @@ static int scgi_spawn_connection(server *srv,
 			}
 		      #ifdef SOCK_CLOEXEC
 			else
-				fcntl(scgi_fd, F_SETFD, 0); /* clear cloexec */
+				(void)fcntl(scgi_fd, F_SETFD, 0); /* clear cloexec */
 		      #endif
 
 			/* we don't need the client socket */