[Improvement] NOB_NO_ECHO

[victor-Lopez25]

I like that there's a way to remove the echo from nob.h but shouldn't it just be one of the options in Nob_Log_Level?
That way there would be no need to special case it by using NOB_NO_ECHO.

typedef enum {
    NOB_ECHO = -1,
    NOB_INFO,
    NOB_WARNING,
    NOB_ERROR,
    NOB_NO_LOGS,
} Nob_Log_Level;

// ...

NOBDEF void nob_log(Nob_Log_Level level, const char *fmt, ...)
{
    if (level < nob_minimal_log_level) return;

    switch (level) {
    case NOB_ECHO:
    case NOB_INFO:
        fprintf(stderr, "[INFO] ");
        break;
    case NOB_WARNING:
        fprintf(stderr, "[WARNING] ");
        break;
    case NOB_ERROR:
        fprintf(stderr, "[ERROR] ");
        break;
    case NOB_NO_LOGS: return;
    default:
        NOB_UNREACHABLE("nob_log");
    }

    // ...

[victor-Lopez25]

I'll make a pull request with the change if you think it's better.