Remove usage of non-existing MAX_LINE_LENGTH constant

This constant was deleted in php@3e5afbf#diff-f8c1cfc7c2ca0db20a3a595ab6de0e43L20

Author: orlandothoeny

sapi/fpm/fpm/fpm_log.c

@@ -19,11 +19,7 @@
 #include "fastcgi.h"
 #include "zlog.h"
 
-#ifdef MAX_LINE_LENGTH
-# define FPM_LOG_BUFFER MAX_LINE_LENGTH
-#else
 # define FPM_LOG_BUFFER 1024
-#endif
 
 static char *fpm_log_format = NULL;
 static int fpm_log_fd = -1;