Inline calls to print_line_if_context

[petdance]

In the main loop, if the line isn't a match, we do this:

            else {
                chomp; # XXX Proper newline handling?
                print_line_if_context( $filename, $_, $., '-' );
            }   

If we're not doing context (the most common case), then the chomp is unnecessary and the print_line_if_context is unnecessary.

Let's look at inlining that code, since we're not going to be making any more functionality changes in ack2, and keep this in mind in ack3.

[petdance]

In my basic testing, it sped things up about 4%.

[petdance]

Can't inline this.