dash bug: double-quoted "\" breaks glob protection for next char

[Denys Vlasenko <vda.linux@xxxxxxxxxxxxxx>]

$ >'\zzzz'
$ >'\wwww'
$ dash -c 'echo "\*"'
\wwww \zzzz

The cause: uses "\\*" pattern instead of "\\\*".
The fix:

                        /* backslash */
                        case CBACK:
                                c = pgetc2();
                                if (c == PEOF) {
                                        USTPUTC(CTLESC, out);
                                        USTPUTC('\\', out);
                                        pungetc();
                                } else if (c == '\n') {
                                        nlprompt();
                                } else {
                                        if (
                                                dblquote &&
                                                c != '\\' && c != '`' &&
                                                c != '$' && (
                                                        c != '"' ||
                                                        eofmark != NULL
                                                )
                                        ) {
USTPUTC(CTLESC, out); // add this line
                                                USTPUTC('\\', out);
                                        }
                                        USTPUTC(CTLESC, out);
                                        USTPUTC(c, out);
                                        quotef++;
                                }
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