Simplify some more AND bool expressions.
Simplify some more AND bool expressions.

If an expression is of the form of "left && right" and one of the parts
is constant and true, then the whole boolean expression can be replaced
with the other subexpression. So "left && true" becomes "left" and "true
&& right" becomes "right".

vslavik/bakefile,vslavik/bakefile,vslavik/bakefile