Fix MSI parsing of string literals

[Troy Rollo]

The attached patch fixes a problem in parsing of string literals. The existing 
code will only correctly process string literals that contain either an 
identifier or a number, but a string literal can contain any string of 
characters other than the double quote character: 
<http://msdn.microsoft.com/library/en-us/msi/setup/conditional_statement_syntax.asp>

The Office 2000 install requires this - it has a string literal "clean/nav" in 
one of the expressions it uses.

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