[PATCH] ash fancy prompt expansion

[Natanael Copa]

Hi,

Attatched is a patch that fixes the annoying bug in ash prmpt expansion.

Currently the default PS1='\w \$ ' will always show a '$' as prompt
while PS1='\w \\$ ' will show a '#' if effective user is root and '$'
otherwise.

The problem is that the prompt string is expanded as a normal double
quote expansion (readtoken1()) before its sent to the
libbb/lineedit.c:parse_prompt() function. The function readtoken1() will
correctly convert '\$' to '$' before its send to parse_prompt() which is
looking for '\$'.

The attatched patch adds a PSSYNTAX expansion style which is identical
as the DQSYNTAX, except that it keep '\$' as '\$'.

The patch is my contribution to the mess. Please let me know if there
are better ways to handle this.

-nc
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