Make Boost Jam's == && != operators not ignore trailing empty strings.

[jurko.gospodnetic@…]

Make Boost Jam's == && != operators not ignore trailing empty strings in the lists they are given as operands to compare.

When and if this is done Boost Build code should be reviewed for any unexpected side-effects. One thing potentially affected by this is Boost Build's assert.jam module.

Workaround for this available with the current Boost Jam is to simply append a non-empty string to the end of both list operands.

[jurko.gospodnetic@…]

Boost Jam's lcmp() function in the compile.c module could have something to do with this, called by the compile_eval() function below it to process parsed Jam operator tokens.