Fix bug #4327 mkdir create failed on coroutines

[NathanFreeman]

Fix bug #4327.
One of these coroutines can create top level directory successfully, but other coroutines will fail because the top directory has been created.

So I add this code to solve it. (plain_wrapper.c 1086)

if (p == buf) {
    ret = mkdir(dir, mode);
} else if (!(ret = mkdir(buf, mode)) || EEXIST == errno) {
    if (!p) {
        p = buf;
    }
    /* create any needed directories if the creation of the 1st directory worked */
    while (++p != e) {
        if (*p == '\0') {
            *p = DEFAULT_SLASH;
            if ((*(p + 1) != '\0') && (ret = mkdir(buf, (mode_t) mode)) < 0) {
                // parent directory already exists and try to create child directories.
                if (EEXIST == errno && (int) strlen(buf) < dir_len) {
                    continue;
                }

                if (options & REPORT_ERRORS) {
                    php_error_docref(NULL, E_WARNING, "%s", strerror(errno));
                }
                break;
            }
        }
    }
}

Thanks!

[matyhtf]

@NathanFreeman Good job

[mifei077]

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