[fpc-pascal] Windows backslasht

[Marco van de Voort]

In our previous episode, Bart said:
> But then the shell would make it \-\.
> 
> Converting SomePath\^-^\SomePath into SomePath^-^\SomePath looks more like C...

Make could also be doing own substitutions, so is not a good testing
platform to draw conclusions off. Note that I haven't tested that much, I
just saw the hint about ^ being NT escape, and guessed the rest pretty much.