Fix blc_stderr_ansi undefined

src/blc_program.cpp

@@ -457,7 +457,7 @@ void blc_program_init(int *argc, char ***argv, void (*exit_cb)(void))
     blc_output_terminal=isatty(STDOUT_FILENO);
     
     if (isatty(STDERR_FILENO) && blc_input_terminal) blc_stderr_ansi=1;
-    else blc_stderr_ansi; //This is not waranty. It is safer to use blc_stderr_ansi_detect but it causes trouble when many program are launched at once
+    else blc_stderr_ansi=0; //This is not waranty. It is safer to use blc_stderr_ansi_detect but it causes trouble when many program are launched at once
     
     blc_program_add_option(&profile, '~', "profile", "filename", "profile the execution of the loop", NULL);
     blc_program_add_option(&help, 'h', "help", 0, "display this help", NULL);